diff --git a/apps/photocraft/src/services.rs b/apps/photocraft/src/services.rs
index 60d8c5e905..ba70d6e1df 100644
--- a/apps/photocraft/src/services.rs
+++ b/apps/photocraft/src/services.rs
@@ -201,10 +201,10 @@ fn show_file_dialog(request: FileDialogRequest, parent: Option<&eframe::Frame>,
             };
             if multiple {
                 let picked = dialog.pick_files();
-                Box::pin(async move { picked.await.map(|files| FileDialogAnswer::Paths(files.iter().map(path_of).collect())) })
+                Box::pin(async move { picked.await.map(|files| answer(files.iter().map(|f| f.path()), false, FileDialogAnswer::Paths)) })
             } else {
                 let picked = dialog.pick_file();
-                Box::pin(async move { picked.await.map(|file| FileDialogAnswer::Paths(vec![path_of(&file)])) })
+                Box::pin(async move { picked.await.map(|file| answer([file.path()], false, FileDialogAnswer::Paths)) })
             }
         }
         FileDialogRequest::Folder { initial_dir } => {
@@ -212,7 +212,7 @@ fn show_file_dialog(request: FileDialogRequest, parent: Option<&eframe::Frame>,
                 dialog = dialog.set_directory(dir);
             }
             let picked = dialog.pick_folder();
-            Box::pin(async move { picked.await.map(|folder| FileDialogAnswer::FolderTo(path_of(&folder))) })
+            Box::pin(async move { picked.await.map(|folder| answer_one(folder.path(), true, FileDialogAnswer::FolderTo)) })
         }
         FileDialogRequest::Save { suggested } => {
             let filters = save_filters(&suggested);
@@ -247,10 +247,10 @@ fn show_file_dialog(request: FileDialogRequest, parent: Option<&eframe::Frame>,
                         .map_err(|e| e.to_string())
                         .and_then(|conn| crate::portal_save::save_as(&conn, req));
                     match portal {
-                        Ok(path) => path.map(|p| FileDialogAnswer::SaveTo(p.to_string_lossy().into_owned())),
+                        Ok(path) => path.map(|p| answer_one(&p, true, FileDialogAnswer::SaveTo)),
                         Err(e) => {
                             log::info!("portal save dialog unavailable ({e}), using rfd");
-                            dialog.save_file().await.map(|file| FileDialogAnswer::SaveTo(path_of(&file)))
+                            dialog.save_file().await.map(|file| answer_one(file.path(), true, FileDialogAnswer::SaveTo))
                         }
                     }
                 })
@@ -259,7 +259,7 @@ fn show_file_dialog(request: FileDialogRequest, parent: Option<&eframe::Frame>,
             {
                 let _ = filters;
                 let picked = dialog.save_file();
-                Box::pin(async move { picked.await.map(|file| FileDialogAnswer::SaveTo(path_of(&file))) })
+                Box::pin(async move { picked.await.map(|file| answer_one(file.path(), true, FileDialogAnswer::SaveTo)) })
             }
         }
     };
@@ -273,8 +273,22 @@ fn show_file_dialog(request: FileDialogRequest, parent: Option<&eframe::Frame>,
     }
 }
 
-fn path_of(file: &rfd::FileHandle) -> String {
-    file.path().to_string_lossy().into_owned()
+/// The dialog's answer for the chosen `paths`, or the error for one whose name isn't valid
+/// Unicode, which a lossy copy would turn into another file's name (#6601). `saving`: the paths
+/// are to be written to.
+fn answer<'a>(paths: impl IntoIterator<Item = &'a Path>, saving: bool, make: impl FnOnce(Vec<String>) -> FileDialogAnswer) -> FileDialogAnswer {
+    match paths.into_iter().map(|p| photocraft_ui_egui::file_open::path_text(p, saving)).collect() {
+        Ok(paths) => make(paths),
+        Err(e) => FileDialogAnswer::Unavailable(e),
+    }
+}
+
+/// [`answer`] for a dialog that picks one path.
+fn answer_one(path: &Path, saving: bool, make: impl FnOnce(String) -> FileDialogAnswer) -> FileDialogAnswer {
+    match photocraft_ui_egui::file_open::path_text(path, saving) {
+        Ok(path) => make(path),
+        Err(e) => FileDialogAnswer::Unavailable(e),
+    }
 }
 
 /// Runs `future` to completion on this thread, sleeping until it is woken.
@@ -757,6 +771,31 @@ mod tests {
     use photocraft_ui_egui::{PhotocraftApp, prefs_ui};
     use serde_json::{Value, json};
 
+    /// #6601: a chosen path whose name isn't valid Unicode is reported, never handed on lossily
+    /// (Open would fail with "No such file", Save would write a second, renamed file).
+    #[test]
+    fn a_chosen_path_that_is_not_valid_unicode_is_an_error_not_another_name() {
+        #[cfg(unix)]
+        let bad = {
+            use std::os::unix::ffi::OsStrExt;
+            std::env::temp_dir().join(std::ffi::OsStr::from_bytes(b"img\xFF.png"))
+        };
+        #[cfg(windows)]
+        let bad = {
+            use std::os::windows::ffi::OsStringExt;
+            let mut wide: Vec<u16> = "img".encode_utf16().collect();
+            wide.push(0xD800);
+            wide.extend(".png".encode_utf16());
+            std::env::temp_dir().join(std::ffi::OsString::from_wide(&wide))
+        };
+        let good = std::env::temp_dir().join("ok.png");
+        let save = |path: &Path| answer_one(path, true, FileDialogAnswer::SaveTo);
+        assert!(matches!(save(&bad), FileDialogAnswer::Unavailable(e) if e.contains("not valid Unicode") && e.contains("another name")));
+        assert!(matches!(save(&good), FileDialogAnswer::SaveTo(p) if p == good.to_str().unwrap()));
+        let open = answer([good.as_path(), bad.as_path()], false, FileDialogAnswer::Paths);
+        assert!(matches!(open, FileDialogAnswer::Unavailable(e) if e.contains("open it again")));
+    }
+
     /// #6121: the file type picked in the save dialog gives the name its extension where the
     /// dialog left the one it opened with, and only there.
     #[test]
diff --git a/contributors/people.toml b/contributors/people.toml
index b16a778dee..c54a3c4bb1 100644
--- a/contributors/people.toml
+++ b/contributors/people.toml
@@ -197,3 +197,7 @@ sync_github_name = true
 
 [people.webdevtodayjason]
 display_name = "Jason Brashear"
+
+[people.AndreeSalazar]
+real_name = "Andreé Salazar"
+sync_github_name = true
diff --git a/crates/codecs/src/codecs/png.rs b/crates/codecs/src/codecs/png.rs
index f894b3a30d..085246b3f1 100644
--- a/crates/codecs/src/codecs/png.rs
+++ b/crates/codecs/src/codecs/png.rs
@@ -676,8 +676,8 @@ mod stereo_tests {
 
     #[test]
     fn reads_both_defined_views() {
-        assert_eq!(stereo(&png_with(&[0])), Some(PngStereo::Horizontal));
-        assert_eq!(stereo(&png_with(&[1])), Some(PngStereo::Vertical));
+        assert_eq!(stereo(&png_with(&[0])), Some(PngStereo::CrossFuse));
+        assert_eq!(stereo(&png_with(&[1])), Some(PngStereo::DivergingFuse));
         assert_eq!(stereo(&png_with(&[])), None);
         // Reserved and unknown mode bytes are not a pairing we can keep.
         assert_eq!(stereo(&png_with(&[2])), None);
@@ -687,6 +687,24 @@ mod stereo_tests {
         assert_eq!(stereo(b"not a png"), None);
     }
 
+    #[test]
+    fn ster_mode_bytes_describe_eye_order_not_vertical_packing() {
+        // PNG Extensions 1.4.0 §3.6: both views occupy horizontal halves.
+        // Each view is eight columns, so the second starts on an eight-column boundary.
+        for (mode, left_pixel, right_pixel) in [(0, [0, 0, 255], [255, 0, 0]), (1, [255, 0, 0], [0, 0, 255])] {
+            let pixels: Vec<u8> = [left_pixel; 8].into_iter().chain([right_pixel; 8]).flatten().collect();
+            let img = Image::from_raw(16, 1, ChannelLayout::Rgb, SampleType::U8, pixels.clone()).unwrap();
+            let pairing = if mode == 0 { PngStereo::CrossFuse } else { PngStereo::DivergingFuse };
+            let opts = EncodeOptions { png_stereo: Some(pairing), ..Default::default() };
+            let bytes = crate::encode(&img, Format::Png, &opts).unwrap();
+            let chunk = bytes.windows(4).position(|w| w == b"sTER").unwrap();
+            assert_eq!(bytes[chunk + 4], mode, "the specification's literal mode byte");
+            let decoded = decode(&bytes, &Limits::default()).unwrap();
+            assert_eq!(decoded.dimensions(), (16, 1));
+            assert_eq!(decoded.data(), pixels);
+        }
+    }
+
     #[test]
     fn a_broken_crc_is_not_a_stereo_mark() {
         let mut bytes = png_with(&[0]);
@@ -699,7 +717,7 @@ mod stereo_tests {
     #[test]
     fn encode_writes_the_chunk_before_idat_and_it_reads_back() {
         let img = Image::from_raw(2, 1, ChannelLayout::Rgb, SampleType::U8, vec![9; 6]).unwrap();
-        for view in [PngStereo::Horizontal, PngStereo::Vertical] {
+        for view in [PngStereo::CrossFuse, PngStereo::DivergingFuse] {
             let opts = EncodeOptions { png_stereo: Some(view), ..Default::default() };
             let bytes = crate::encode(&img, Format::Png, &opts).unwrap();
             assert_eq!(stereo(&bytes), Some(view));
@@ -716,12 +734,12 @@ mod stereo_tests {
     #[test]
     fn interlaced_and_indexed_encoders_keep_the_mark() {
         let img = Image::from_raw(2, 2, ChannelLayout::Rgb, SampleType::U8, vec![9; 12]).unwrap();
-        let opts = EncodeOptions { png_stereo: Some(PngStereo::Vertical), png_interlaced: true, ..Default::default() };
+        let opts = EncodeOptions { png_stereo: Some(PngStereo::DivergingFuse), png_interlaced: true, ..Default::default() };
         let bytes = crate::encode(&img, Format::Png, &opts).unwrap();
-        assert_eq!(stereo(&bytes), Some(PngStereo::Vertical));
+        assert_eq!(stereo(&bytes), Some(PngStereo::DivergingFuse));
         let pal = [[255, 0, 0], [0, 0, 255]];
-        let bytes = encode_indexed(2, 1, &[0, 1], &pal, None, None, Some(PngStereo::Horizontal)).unwrap();
-        assert_eq!(stereo(&bytes), Some(PngStereo::Horizontal));
+        let bytes = encode_indexed(2, 1, &[0, 1], &pal, None, None, Some(PngStereo::CrossFuse)).unwrap();
+        assert_eq!(stereo(&bytes), Some(PngStereo::CrossFuse));
         assert_eq!(palette(&bytes).unwrap().map(|p| p.colors), Some(pal.to_vec()));
     }
 }
diff --git a/crates/codecs/src/codecs/tga.rs b/crates/codecs/src/codecs/tga.rs
index 7b52533d7b..2f382efcf3 100644
--- a/crates/codecs/src/codecs/tga.rs
+++ b/crates/codecs/src/codecs/tga.rs
@@ -88,3 +88,88 @@ fn rle_row(row: &[u8], bpp: usize, out: &mut Vec<u8>) {
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn run_packets_at_the_128_pixel_boundary() {
+        for bpp in 1..=4 {
+            for (pixels, headers) in [(1, vec![0]), (2, vec![0x81]), (127, vec![0xfe]), (128, vec![0xff]), (129, vec![0xff, 0])] {
+                let pixel: Vec<u8> = (1..=bpp as u8).collect();
+                let mut encoded = Vec::new();
+                rle_row(&pixel.repeat(pixels), bpp, &mut encoded);
+                let expected: Vec<u8> = headers.into_iter().flat_map(|header| std::iter::once(header).chain(pixel.iter().copied())).collect();
+                assert_eq!(encoded, expected, "{pixels} pixels, {bpp} bytes per pixel");
+            }
+        }
+    }
+
+    #[test]
+    fn raw_packets_at_the_128_pixel_boundary() {
+        for bpp in 1..=4 {
+            for pixels in [127usize, 128, 129] {
+                let row: Vec<u8> = (0..pixels).flat_map(|x| vec![x as u8; bpp]).collect();
+                let mut encoded = Vec::new();
+                rle_row(&row, bpp, &mut encoded);
+                let mut expected = vec![(pixels.min(128) - 1) as u8];
+                expected.extend_from_slice(&row[..pixels.min(128) * bpp]);
+                if pixels > 128 {
+                    expected.push(0);
+                    expected.extend_from_slice(&row[128 * bpp..]);
+                }
+                assert_eq!(encoded, expected, "{pixels} pixels, {bpp} bytes per pixel");
+            }
+        }
+    }
+
+    #[test]
+    fn raw_packets_stop_before_a_run_of_complete_pixels() {
+        // Equal first channels alone do not make an RGBA run; alpha participates too.
+        let a = [10, 20, 30, 40];
+        let b = [10, 20, 30, 41];
+        let c = [50, 60, 70, 80];
+        let row = [a, b, c, c, a].concat();
+        let mut encoded = Vec::new();
+        rle_row(&row, 4, &mut encoded);
+        assert_eq!(encoded, [vec![1], a.to_vec(), b.to_vec(), vec![0x81], c.to_vec(), vec![0], a.to_vec()].concat());
+    }
+
+    #[test]
+    fn rejects_sample_types_and_layouts_targa_cannot_store() {
+        for sample in [SampleType::U16, SampleType::F16, SampleType::F32] {
+            let img = Image::new(1, 1, ChannelLayout::Rgb, sample).unwrap();
+            assert!(matches!(encode(&img), Err(CodecError::Encode { format: Format::Tga, .. })), "{sample:?}");
+        }
+        for layout in [ChannelLayout::Cmyk, ChannelLayout::CmykA, ChannelLayout::Lab, ChannelLayout::LabA] {
+            let img = Image::new(1, 1, layout, SampleType::U8).unwrap();
+            assert!(matches!(encode(&img), Err(CodecError::Encode { format: Format::Tga, .. })), "{layout:?}");
+        }
+    }
+
+    #[test]
+    fn dimensions_fit_the_unsigned_16_bit_header() {
+        for (width, height) in [(65535, 1), (1, 65535)] {
+            let img = Image::new(width, height, ChannelLayout::Gray, SampleType::U8).unwrap();
+            let file = encode(&img).unwrap();
+            assert_eq!(&file[12..14], &(width as u16).to_le_bytes());
+            assert_eq!(&file[14..16], &(height as u16).to_le_bytes());
+        }
+        for (width, height) in [(65536, 1), (1, 65536)] {
+            let img = Image::new(width, height, ChannelLayout::Gray, SampleType::U8).unwrap();
+            assert!(matches!(encode(&img), Err(CodecError::Encode { format: Format::Tga, .. })), "{width}x{height}");
+        }
+    }
+
+    #[test]
+    fn invalid_buffers_are_rejected_before_targa_encoding() {
+        // Image keeps its buffer private, so malformed buffers must fail at construction.
+        for layout in [ChannelLayout::Gray, ChannelLayout::GrayA, ChannelLayout::Rgb, ChannelLayout::Rgba] {
+            let len = 2 * 2 * layout.channels();
+            for bytes in [len - 1, len + 1] {
+                assert!(matches!(Image::from_u8(2, 2, layout, vec![0; bytes]), Err(CodecError::InvalidImage(_))), "{layout:?}: {bytes} bytes");
+            }
+        }
+    }
+}
diff --git a/crates/codecs/src/options.rs b/crates/codecs/src/options.rs
index 258779d823..1f7b249722 100644
--- a/crates/codecs/src/options.rs
+++ b/crates/codecs/src/options.rs
@@ -103,18 +103,18 @@ pub enum PngCompression {
 /// How a PNG's `sTER` chunk pairs its two views (PNG Extensions 1.4.0, §3.6).
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum PngStereo {
-    /// Left and right views side by side, left first.
-    Horizontal,
-    /// Left and right views stacked, left on top.
-    Vertical,
+    /// Side by side with the right-eye view first (cross-eyed viewing, mode 0).
+    CrossFuse,
+    /// Side by side with the left-eye view first (parallel viewing, mode 1).
+    DivergingFuse,
 }
 
 impl PngStereo {
     /// The view for an `sTER` mode byte; reserved and unknown values are `None`.
     pub fn from_mode(mode: u8) -> Option<Self> {
         match mode {
-            0 => Some(Self::Horizontal),
-            1 => Some(Self::Vertical),
+            0 => Some(Self::CrossFuse),
+            1 => Some(Self::DivergingFuse),
             _ => None,
         }
     }
@@ -122,8 +122,8 @@ impl PngStereo {
     /// The `sTER` mode byte.
     pub fn mode(self) -> u8 {
         match self {
-            Self::Horizontal => 0,
-            Self::Vertical => 1,
+            Self::CrossFuse => 0,
+            Self::DivergingFuse => 1,
         }
     }
 }
diff --git a/crates/doc/src/lib.rs b/crates/doc/src/lib.rs
index 268b0b6b43..8752bbd7bb 100644
--- a/crates/doc/src/lib.rs
+++ b/crates/doc/src/lib.rs
@@ -933,7 +933,8 @@ pub struct FileEncoding {
     #[serde(skip_serializing_if = "Option::is_none")]
     pub webp_quality: Option<u8>,
     /// PNG stereo pairing (the `sTER` chunk's mode byte, PNG Extensions 1.4.0 §3.6): `Some(0)`
-    /// side by side, `Some(1)` stacked, so saving a stereo PNG keeps the mark (#6063).
+    /// cross-fuse (right eye first), `Some(1)` diverging-fuse (left eye first). Both are
+    /// side by side; saving a stereo PNG keeps this eye-order mark (#6063).
     #[serde(skip_serializing_if = "Option::is_none")]
     pub png_stereo: Option<u8>,
 }
diff --git a/crates/engine/src/file_cmds.rs b/crates/engine/src/file_cmds.rs
index 904c3e7dce..c5e9d464ce 100644
--- a/crates/engine/src/file_cmds.rs
+++ b/crates/engine/src/file_cmds.rs
@@ -276,11 +276,35 @@ pub(crate) fn join(dir: &str, name: &str) -> String {
     }
 }
 
-/// A file-name-safe version of a layer name.
+/// A file-name-safe version of a layer name. A Windows device name (`nul`, `con.v2`) gets a `_`
+/// before its first dot, so the file or folder is usable on Windows, wherever it was written.
 pub(crate) fn sanitize(name: &str) -> String {
     let s: String = name.chars().map(|c| if c.is_alphanumeric() || matches!(c, '-' | '_' | ' ' | '.') { c } else { '_' }).collect();
     let s = s.trim().trim_matches('.').to_string();
-    if s.is_empty() { "layer".into() } else { s }
+    if s.is_empty() { "layer".into() } else { portable_device_name(s) }
+}
+
+/// `name` with a `_` before its first dot when it is a Windows device name (`nul` → `nul_`,
+/// `com1.v2` → `com1_.v2`); a `_` at the end would leave the device stem in place.
+pub(crate) fn portable_device_name(name: String) -> String {
+    if !is_windows_device_name(&name) {
+        return name;
+    }
+    match name.split_once('.') {
+        Some((device, rest)) => format!("{device}_.{rest}"),
+        None => format!("{name}_"),
+    }
+}
+
+/// Whether `component` names a Windows device (`CON`, `NUL`, `COM1`…, with any extension):
+/// Windows opens the device instead of a file or folder of that name. `COM` and `LPT` take the
+/// superscript digits ¹ ² ³ as well, as Windows does.
+pub(crate) fn is_windows_device_name(component: &str) -> bool {
+    let stem = component.split('.').next().unwrap_or(component).trim_end_matches(' ').to_ascii_uppercase();
+    let port = |n: &str| matches!(n, "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" | "¹" | "²" | "³");
+    matches!(stem.as_str(), "CON" | "PRN" | "AUX" | "NUL" | "CLOCK$" | "CONIN$" | "CONOUT$")
+        || stem.strip_prefix("COM").is_some_and(port)
+        || stem.strip_prefix("LPT").is_some_and(port)
 }
 
 pub(crate) fn import(name: &str, bytes: &[u8]) -> Result<Document> {
@@ -762,7 +786,42 @@ fn xml_escape(s: &str) -> String {
 }
 
 fn xml_unescape(s: &str) -> String {
-    s.replace("&lt;", "<").replace("&gt;", ">").replace("&quot;", "\"").replace("&apos;", "'").replace("&amp;", "&")
+    let mut out = String::with_capacity(s.len());
+    let mut rest = s;
+    while let Some(i) = rest.find('&') {
+        out.push_str(&rest[..i]);
+        rest = &rest[i..];
+        let decoded = rest.as_bytes().iter().take(13).position(|&b| b == b';').and_then(|e| {
+            let c = match &rest[1..e] {
+                "lt" => '<',
+                "gt" => '>',
+                "quot" => '"',
+                "apos" => '\'',
+                "amp" => '&',
+                n => {
+                    let n = n.strip_prefix('#')?;
+                    let code = match n.strip_prefix(['x', 'X']) {
+                        Some(h) => u32::from_str_radix(h, 16).ok()?,
+                        None => n.parse().ok()?,
+                    };
+                    char::from_u32(code)?
+                }
+            };
+            Some((c, e + 1))
+        });
+        match decoded {
+            Some((c, len)) => {
+                out.push(c);
+                rest = &rest[len..];
+            }
+            None => {
+                out.push('&');
+                rest = &rest[1..];
+            }
+        }
+    }
+    out.push_str(rest);
+    out
 }
 
 /// The element `<tag …>…</tag>` (first occurrence) as (start, end, inner).
@@ -863,6 +922,18 @@ fn short_num(v: f64, decimals: usize) -> String {
     if s.contains('.') { s.trim_end_matches('0').trim_end_matches('.').to_string() } else { s }
 }
 
+/// `v` to three significant digits, with no trailing zeros (0.031714 → "0.0317", 0.4 → "0.4").
+/// Two decimals threw away most of a slow shutter speed: a stored 0.031714 s printed as "0.03 s",
+/// which is 5 % off, and a stored 0.0215 s printed as "0.02 s", 7 % off (#6958).
+fn sig3(v: f64) -> String {
+    let magnitude = v.abs().log10().floor();
+    // Clamped at both ends: a value at the large end must not ask for a negative field width, and
+    // at the small end the field is widened rather than truncated, so a positive exposure never
+    // reads as "0 s". 320 is beyond f64's decimal range, so it always terminates.
+    let decimals = if magnitude.is_finite() { (2.0 - magnitude).clamp(0.0, 320.0) } else { 0.0 };
+    short_num(v, decimals as usize)
+}
+
 /// Exposure time as cameras print it: "1/250 s" for fractions of a second, "0.4 s" or "2 s"
 /// when the reciprocal isn't a whole number or the exposure is a second or longer.
 fn exposure_text(t: f64) -> Option<String> {
@@ -870,10 +941,18 @@ fn exposure_text(t: f64) -> Option<String> {
         return None;
     }
     let r = 1.0 / t;
-    if t < 1.0 && r.round() > 1.0 && (r - r.round()).abs() <= r * 0.01 {
-        return Some(format!("1/{} s", r.round()));
+    let n = r.round();
+    // Below 1/10 s the reciprocal is above 10, so its nearest whole number puts the shown time
+    // within 5 % of the stored one, and is the form a photographer expects ("1/32 s"). The test
+    // used to be relative to the reciprocal, so it shrank as the exposure slowed: under 1/50 s it
+    // fell below half a rounding step and nearly every fraction fell through to the decimal form
+    // (#6958). Above 1/10 s the fraction is only right when the reciprocal is very nearly whole
+    // (1/2 s, 1/4 s) — 0.4 s stays "0.4 s" rather than becoming "1/3 s".
+    let fraction = n.is_finite() && (1.0..=1e9).contains(&n) && (t < 0.1 || (t < 1.0 && n > 1.0 && (r - n).abs() <= r * 0.01));
+    if fraction {
+        return Some(format!("1/{} s", n as u64));
     }
-    Some(format!("{} s", short_num(t, if t < 1.0 { 2 } else { 1 })))
+    Some(format!("{} s", sig3(t)))
 }
 
 /// EXIF (`2024:02:17 12:40:19`) or XMP (`2024-02-17T12:40:19.00+01:00`) dates as
diff --git a/crates/engine/src/file_cmds/tests.rs b/crates/engine/src/file_cmds/tests.rs
index 53b0f1024f..2a52155ca2 100644
--- a/crates/engine/src/file_cmds/tests.rs
+++ b/crates/engine/src/file_cmds/tests.rs
@@ -648,6 +648,54 @@ fn camera_data_formats_like_photoshop_and_falls_back_to_xmp() {
     assert_eq!(camera_data(Some(b"II*\0\xff\xff\xff\xff"), Some("<exif:FNumber>0/0</exif:FNumber> exif:ExposureTime=\"-1/0\"")), json!({}));
 }
 
+/// A slow shutter speed whose reciprocal is not whole prints as the nearest fraction a camera
+/// would write, not as two decimals. The old 1 %-of-the-reciprocal test shrank as the exposure
+/// slowed, so below 1/50 s it fell below half a rounding step and nearly every such fraction fell
+/// through to the decimal form (#6958).
+#[test]
+fn camera_data_prints_a_slow_exposure_as_the_fraction_a_camera_writes() {
+    let text = |t: f64| exposure_text(t).expect("an exposure");
+    // The two values from the report: 31714/1000000 s and 215/10000 s.
+    assert_eq!(text(0.031_714), "1/32 s", "a stored 0.031714 s is about 1/32 s");
+    assert_eq!(text(0.0215), "1/47 s", "a stored 0.0215 s is about 1/47 s");
+    // The rest of a slow shutter scale, and the exact reciprocals that already worked.
+    assert_eq!(text(0.125), "1/8 s");
+    assert_eq!(text(1.0 / 60.0), "1/60 s");
+    assert_eq!(text(1.0 / 4000.0), "1/4000 s");
+    assert_eq!(text(0.04), "1/25 s");
+    assert_eq!(text(0.09), "1/11 s");
+    // Every shown time stays within 5 % of the stored one — the point of the report.
+    for t in [0.031_714, 0.0215, 0.04, 0.09, 0.125, 1.0 / 60.0, 1.0 / 4000.0] {
+        let n: f64 = text(t).split('/').nth(1).and_then(|d| d.split(' ').next()).expect("1/n s").parse().expect("a number");
+        assert!((1.0 / n / t - 1.0).abs() <= 0.05, "{t} shown as {} is more than 5 % off", text(t));
+    }
+    // A tenth of a second and longer keeps the Photoshop forms: a near-whole reciprocal is a
+    // fraction, anything else is the decimal at three significant digits.
+    assert_eq!(text(0.5), "1/2 s");
+    assert_eq!(text(0.25), "1/4 s");
+    assert_eq!(text(0.4), "0.4 s");
+    assert_eq!(text(0.105), "0.105 s", "two decimals would read 0.11 s");
+    assert_eq!(text(1.25), "1.25 s", "one decimal would read 1.3 s");
+    assert_eq!(text(2.0), "2 s");
+    // A hostile value cannot panic, and a positive exposure never reads as "0 s" (never-crash, rule 9).
+    assert_ne!(exposure_text(f64::MIN_POSITIVE).as_deref(), Some("0 s"));
+    assert_ne!(exposure_text(f64::MIN_POSITIVE), None);
+    assert_eq!(exposure_text(0.0), None);
+    assert_eq!(exposure_text(-1.0), None);
+    assert_eq!(exposure_text(f64::NAN), None);
+    assert_eq!(exposure_text(f64::INFINITY), None);
+    assert_ne!(exposure_text(f64::MAX), None);
+    // The same through a real EXIF block, so the round trip to File Info is covered too.
+    let camera = |t: f64| {
+        let exif = photocraft_algo::exif::build(&photocraft_algo::exif::CameraInfo { exposure_time: Some(t), ..Default::default() });
+        camera_data(Some(&exif), None)["exposure"].as_str().map(str::to_owned)
+    };
+    assert_eq!(camera(0.031_714), Some("1/32 s".to_owned()));
+    assert_eq!(camera(0.0215), Some("1/47 s".to_owned()));
+    // An absurd exposure is capped to one dialog line, as every other camera field is.
+    assert!(camera(f64::MAX).expect("an exposure").len() <= 200, "a huge exposure must stay on one dialog line");
+}
+
 const MULTILINGUAL_XMP: &str = r#"<x:xmpmeta xmlns:x="adobe:ns:meta/">
 <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
 <rdf:Description rdf:about="" xmlns:dc="http://purl.org/dc/elements/1.1/"
@@ -1541,7 +1589,7 @@ fn batch_naming_rejects_outputs_that_replace_inputs_before_processing() {
 
 #[test]
 fn exposure_text_near_one_second_is_not_one_over_one() {
-    assert_eq!(exposure_text(0.996).as_deref(), Some("1 s"));
+    assert_eq!(exposure_text(0.996).as_deref(), Some("0.996 s"), "not \"1/1 s\"; three significant digits");
     assert_eq!(exposure_text(0.99).as_deref(), Some("0.99 s"));
     assert_eq!(exposure_text(1.0 / 250.0).as_deref(), Some("1/250 s"));
 }
@@ -1596,3 +1644,20 @@ fn save_a_copy_writes_the_tiff_compression_asked_for() {
         assert_eq!(state(&s), before, "{bad}: the document is as it was");
     }
 }
+
+#[test]
+fn sanitize_keeps_windows_device_names_off_the_disk() {
+    assert_eq!(sanitize("nul"), "nul_");
+    assert_eq!(sanitize("CON"), "CON_");
+    assert_eq!(sanitize("com1.v2"), "com1_.v2");
+    assert_eq!(sanitize("lpt9 .final"), "lpt9 _.final");
+    assert_eq!(sanitize("COM¹"), "COM¹_");
+    assert_eq!(sanitize("LPT².txt"), "LPT²_.txt");
+    for name in ["nul", "CON", "com1.v2", "lpt9 .final", "aux", "prn", "conin$", "clock$", "COM¹", "lpt³.x"] {
+        assert!(!is_windows_device_name(&sanitize(name)), "{name} -> {}", sanitize(name));
+    }
+    // Names that only start like a device are files like any other.
+    for name in ["console", "normal", "com10", "lpt0", "nullify", "con_", "com⁴", "com¹¹"] {
+        assert_eq!(sanitize(name), name);
+    }
+}
diff --git a/crates/engine/src/image_cmds.rs b/crates/engine/src/image_cmds.rs
index b6ced69ee2..9bbc897149 100644
--- a/crates/engine/src/image_cmds.rs
+++ b/crates/engine/src/image_cmds.rs
@@ -301,7 +301,16 @@ pub(crate) fn resample_doc(doc: &mut Document, nw: u32, nh: u32, filter: Resampl
         *surf = resize_surface_in_canvas(surf, sx, sy, if is_mask { Resample::Bilinear } else { filter }, canvas);
     });
     let k = ((sx + sy) / 2.0) as f32;
-    for_each_layer(&mut doc.layers, &mut |l| scale_effects(&mut l.effects, k));
+    for_each_layer(&mut doc.layers, &mut |l| {
+        scale_effects(&mut l.effects, k);
+        // Canvas resampling scales the whole appearance, including shape strokes (#8341).
+        // Dash lengths and offsets are already expressed in multiples of this width.
+        if let LayerContent::Shape(sh) = &mut l.content
+            && let Some(stroke) = &mut sh.stroke
+        {
+            stroke.width *= k;
+        }
+    });
     for ch in doc.channels.iter_mut().chain(doc.quick_mask.as_mut()) {
         ch.surface = resize_surface_in_canvas(&ch.surface, sx, sy, Resample::Bilinear, canvas);
     }
diff --git a/crates/engine/src/prefs.rs b/crates/engine/src/prefs.rs
index 1344971850..c38608224c 100644
--- a/crates/engine/src/prefs.rs
+++ b/crates/engine/src/prefs.rs
@@ -86,7 +86,7 @@ choice!(UiFontSize { Tiny = "tiny", Small = "small", Medium = "medium", Large =
 choice!(LogDestination { Metadata = "metadata", TextFile = "textFile", Both = "both" } default Metadata);
 choice!(LogDetail { SessionsOnly = "sessionsOnly", Concise = "concise", Detailed = "detailed" } default Concise);
 choice!(Ask { Always = "always", Never = "never", Ask = "ask" } default Always);
-choice!(QuickExportFormat { Png = "png", Jpg = "jpg", Gif = "gif", Webp = "webp" } default Png);
+choice!(QuickExportFormat { Png = "png", Jpg = "jpg", Gif = "gif", Webp = "webp", Exr = "exr" } default Png);
 choice!(ExportLocation { Ask = "ask", SameFolder = "sameFolder" } default Ask);
 choice!(ExportMetadata { None = "none", Copyright = "copyright", All = "all" } default Copyright);
 choice!(
diff --git a/crates/engine/src/print_cmds/tests.rs b/crates/engine/src/print_cmds/tests.rs
index 3dab10b65a..de9e145793 100644
--- a/crates/engine/src/print_cmds/tests.rs
+++ b/crates/engine/src/print_cmds/tests.rs
@@ -987,3 +987,16 @@ fn a_rejected_printable_area_fails_the_print_and_changes_nothing() {
     let r = s.execute("file.print", json!({"paper": "a3", "scaleToFit": true, "printable": [0, 0, 60, 1191.14], "cornerCropMarks": true, "dryRun": true}));
     assert!(r.is_err(), "{r:?}");
 }
+
+#[test]
+fn package_of_a_document_named_after_a_windows_device_is_written() {
+    // On Windows a folder named `nul` is the NUL device: the save failed with "path not found".
+    let dir = tmp("package-device-name");
+    let mut s = Session::new();
+    s.execute("file.new", json!({"width": 8, "height": 8, "name": "nul.psd"})).unwrap();
+    let r = s.execute("file.package", json!({"dir": format!("{dir}/pkg")})).unwrap();
+    assert_eq!(r["folder"].as_str().unwrap(), format!("{dir}/pkg/nul_"));
+    let document = r["document"].as_str().unwrap();
+    assert!(document.ends_with("pkg/nul_/nul_.pcraft"), "{document}");
+    assert!(std::path::Path::new(document).is_file());
+}
diff --git a/crates/engine/src/web_cmds.rs b/crates/engine/src/web_cmds.rs
index f77a020819..894cdca40b 100644
--- a/crates/engine/src/web_cmds.rs
+++ b/crates/engine/src/web_cmds.rs
@@ -19,7 +19,7 @@ use photocraft_geom::Rect;
 use serde_json::{Value, json};
 
 use crate::commands::CommandSpec;
-use crate::file_cmds::{join, native_doc, stem, write_file};
+use crate::file_cmds::{is_windows_device_name, join, native_doc, portable_device_name, stem, write_file};
 use crate::{EngineError, Result, Session};
 
 fn bad(cmd: &str, msg: impl Into<String>) -> EngineError {
@@ -732,7 +732,7 @@ fn slice_file(name: &str) -> String {
 /// Generated filenames should remain usable on Windows even when a document or slice is named
 /// after a reserved device. Caller-supplied path components are still rejected below.
 fn portable_generated_stem(stem: String) -> String {
-    if is_windows_device_asset_name(&stem) { format!("{stem}_") } else { stem }
+    portable_device_name(stem)
 }
 
 fn html_escape(s: &str) -> String {
@@ -1088,6 +1088,15 @@ fn quick_export(s: &mut Session, p: &Value) -> Result<Value> {
     };
     let d = s.active().ok_or(EngineError::NoDocument)?;
     let doc = d.doc.clone();
+    if fmt == "exr" {
+        // EXR keeps floating-point scene values. The ordinary exporter converts to linear
+        // light; the web/sRGB pipeline would instead clamp HDR and negative values.
+        let opts = photocraft_io::ExportOptions { xmp: photocraft_io::XmpEmbed::None, ..Default::default() };
+        let out = photocraft_io::export(&doc, "exr", &opts).map_err(other)?;
+        write_file(&path, &out.bytes)?;
+        crate::automate_cmds::fire_event(s, "export");
+        return Ok(json!({"path": path, "format": fmt, "bytes": out.bytes.len(), "warnings": out.warnings}));
+    }
     let metadata = serde_json::to_value(prefs.metadata).ok().and_then(|v| v.as_str().map(str::to_string)).unwrap_or_default();
     let mut o = serde_json::Map::new();
     o.insert(
@@ -1296,13 +1305,6 @@ fn asset_settings(spec: &AssetSpec) -> WebSettings {
     }
 }
 
-fn is_windows_device_asset_name(component: &str) -> bool {
-    let stem = component.split('.').next().unwrap_or(component).trim_end_matches(' ').to_ascii_uppercase();
-    matches!(stem.as_str(), "CON" | "PRN" | "AUX" | "NUL" | "CLOCK$" | "CONIN$" | "CONOUT$")
-        || stem.strip_prefix("COM").is_some_and(|n| matches!(n, "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9"))
-        || stem.strip_prefix("LPT").is_some_and(|n| matches!(n, "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9"))
-}
-
 /// Layer names and `default` folders are document data, so reject unsafe output components.
 fn asset_path_components(relative: &str) -> Result<Vec<&str>> {
     // Split both separator styles even on Unix, where a backslash would otherwise be a legal
@@ -1316,7 +1318,7 @@ fn asset_path_components(relative: &str) -> Result<Vec<&str>> {
             || part.ends_with(' ')
             || part.contains(':')
             || part.contains('\0')
-            || is_windows_device_asset_name(part)
+            || is_windows_device_name(part)
         {
             return Err(other(format!("asset path {relative:?} has an unsafe component {part:?}")));
         }
@@ -1537,7 +1539,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Export Preferences…",
             &["File", "Export"],
             None,
-            r##"{"quickExportFormat":"png|jpg|gif|webp"?,"quickExportLocation":"ask|sameFolder"?,"jpegQuality":1..100?,"webpLossless":bool?,"webpQuality":1..100?,"metadata":"none|copyright|all"?,"convertToSrgb":bool?} → {values}"##,
+            r##"{"quickExportFormat":"png|jpg|gif|webp|exr"?,"quickExportLocation":"ask|sameFolder"?,"jpegQuality":1..100?,"webpLossless":bool?,"webpQuality":1..100?,"metadata":"none|copyright|all"?,"convertToSrgb":bool?} → {values}"##,
             |_| Ok(()),
             export_preferences
         ),
diff --git a/crates/engine/src/web_cmds/tests.rs b/crates/engine/src/web_cmds/tests.rs
index ea8fe40177..795c3c7b7e 100644
--- a/crates/engine/src/web_cmds/tests.rs
+++ b/crates/engine/src/web_cmds/tests.rs
@@ -167,6 +167,19 @@ fn reserved_document_and_slice_names_export_with_portable_names() {
     assert!(std::path::Path::new(result["html"].as_str().unwrap()).is_file());
 }
 
+#[test]
+fn a_dotted_device_file_name_exports_without_the_device_stem() {
+    // `nul.v2_` would still be the NUL device on Windows; `nul_.v2` is a file.
+    let dir = tmp("reserved-dotted-name");
+    let mut s = session(8);
+    s.execute("slice.new", json!({"rect": [0, 0, 16, 16], "name": "logo"})).unwrap();
+    let path = format!("{dir}/nul.v2.png");
+    let result = s.execute("file.export.saveForWebLegacy", json!({"path": path, "slices": "all", "format": "png24", "html": true})).unwrap();
+    let html = result["html"].as_str().unwrap();
+    assert!(html.ends_with("/nul_.v2.html"), "{html}");
+    assert!(std::path::Path::new(html).is_file());
+}
+
 #[test]
 fn platform_writer_failure_stops_export_and_preserves_saved_settings() {
     let mut s = session(8);
@@ -995,3 +1008,38 @@ fn web_exif_that_does_not_fit_is_reported_and_bad_exif_is_harmless() {
         assert_eq!(decode(&path).dimensions(), (64, 48));
     }
 }
+
+#[test]
+fn quick_export_exr_preserves_linear_hdr_and_alpha() {
+    use photocraft_codecs::{ChannelLayout, Format, Image, SampleType};
+    let dir = tmp("quick_exr_hdr");
+    let samples = [-0.25, 2.0, 0.125, 1.0, 4.0, 0.25, 0.5, 0.5];
+    let image = Image::from_f32(2, 1, ChannelLayout::Rgba, &samples).unwrap();
+    let bytes = photocraft_codecs::encode(&image, Format::OpenExr, &Default::default()).unwrap();
+    let doc = photocraft_io::import("hdr.exr", &bytes).unwrap().document;
+    let mut s = Session::new();
+    s.add_document(doc, Some(format!("{dir}/source.psd")));
+    for convert in [true, false] {
+        s.execute("file.export.exportPreferences", json!({"quickExportFormat": "exr", "quickExportLocation": "sameFolder", "convertToSrgb": convert})).unwrap();
+        let result = s.execute("file.export.quickExport", json!({})).unwrap();
+        assert_eq!(result["format"], "exr");
+        let path = format!("{dir}/source.exr");
+        assert_eq!(result["path"], path);
+        assert_eq!(result["bytes"].as_u64(), Some(std::fs::metadata(&path).unwrap().len()));
+        let decoded = decode(&path);
+        assert_eq!(decoded.sample_type(), SampleType::F32);
+        let actual = decoded.convert(ChannelLayout::Rgba, SampleType::F32).to_f32_samples().unwrap();
+        for (got, expected) in actual.iter().zip(samples) {
+            assert!((got - expected).abs() < 0.0001, "EXR preserves scene values: {actual:?}");
+        }
+        assert_eq!(actual.len(), samples.len());
+    }
+    // The format preference must never silently overwrite the source EXR.
+    let own = format!("{dir}/source.exr");
+    s.active_mut().unwrap().path = Some(own.clone());
+    let before = std::fs::read(&own).unwrap();
+    assert!(s.execute("file.export.quickExport", json!({})).is_err());
+    assert_eq!(std::fs::read(&own).unwrap(), before);
+    s.execute("file.export.quickExport", json!({"path": format!("{dir}/explicit.exr")})).unwrap();
+    assert_eq!(decode(&format!("{dir}/explicit.exr")).dimensions(), (2, 1));
+}
diff --git a/crates/engine/tests/export_shape_strokes.rs b/crates/engine/tests/export_shape_strokes.rs
new file mode 100644
index 0000000000..0875f4bfc0
--- /dev/null
+++ b/crates/engine/tests/export_shape_strokes.rs
@@ -0,0 +1,105 @@
+//! Regression coverage for #8341: canvas resizing must scale shape strokes too.
+use photocraft_doc::{LayerContent, LayerId};
+use photocraft_engine::{
+    Session,
+    web_cmds::{WebSettings, web_document},
+};
+use serde_json::json;
+
+fn shape_session(depth: u32) -> (Session, LayerId) {
+    let mut s = Session::new();
+    s.execute("file.new", json!({"width": 1024, "height": 1024, "depth": depth, "background": "transparent"})).unwrap();
+    let id = s.execute("shape.create", json!({"rect": [256, 256, 512, 512], "fill": null, "stroke": {"width": 32, "color": "#000000"}})).unwrap()["layer"]
+        .as_u64()
+        .unwrap();
+    (s, LayerId(id))
+}
+
+#[test]
+fn web_downscale_keeps_stroke_only_shape_proportions_at_every_depth() {
+    for depth in [8, 16, 32] {
+        let (s, id) = shape_session(depth);
+        let original = &s.active().unwrap().doc;
+        for params in [json!({"percent": 25}), json!({"width": 256, "height": 256})] {
+            let (scaled, sx, sy) = web_document(original, &params, &WebSettings::default()).unwrap();
+            assert_eq!((scaled.size.width, scaled.size.height), (256, 256));
+            assert_eq!((sx, sy), (0.25, 0.25));
+            let LayerContent::Shape(sh) = &scaled.layer(id).unwrap().content else {
+                panic!("shape lost");
+            };
+            assert_eq!(sh.stroke.as_ref().unwrap().width, 8.0, "{depth}-bit stroke");
+            let pixels = photocraft_compose::flatten(&scaled);
+            let alpha = |x: usize| pixels.px[128 * 256 + x][3];
+            assert!(alpha(62) > 0.99, "scaled stroke is visible");
+            assert!(alpha(52) < 0.01, "stroke must not retain its original width");
+            assert!(alpha(128) < 0.01, "no fill is introduced");
+        }
+        let LayerContent::Shape(sh) = &original.layer(id).unwrap().content else {
+            panic!("shape lost");
+        };
+        assert_eq!(sh.stroke.as_ref().unwrap().width, 32.0, "export leaves the source untouched");
+    }
+}
+
+#[test]
+fn image_size_scales_strokes_once_and_undo_restores_them() {
+    let (mut s, id) = shape_session(8);
+    s.execute("shape.edit", json!({"layer": id.0, "stroke": {"dashes": [2, 1], "dashOffset": 0.5}})).unwrap();
+    let before = s.active().unwrap().doc.layer(id).unwrap().clone();
+    s.execute("image.imageSize", json!({"width": 512, "height": 512})).unwrap();
+    let LayerContent::Shape(sh) = &s.active().unwrap().doc.layer(id).unwrap().content else {
+        panic!("shape lost");
+    };
+    assert_eq!(sh.stroke.as_ref().unwrap().width, 16.0);
+    assert_eq!(sh.stroke.as_ref().unwrap().dashes, vec![2.0, 1.0], "dash lengths stay in stroke-width units");
+    assert_eq!(sh.stroke.as_ref().unwrap().dash_offset, 0.5);
+    s.execute("edit.undo", json!({})).unwrap();
+    assert_eq!(s.active().unwrap().doc.layer(id).unwrap(), &before);
+    s.execute("edit.redo", json!({})).unwrap();
+    let LayerContent::Shape(sh) = &s.active().unwrap().doc.layer(id).unwrap().content else {
+        panic!("shape lost");
+    };
+    assert_eq!(sh.stroke.as_ref().unwrap().width, 16.0);
+}
+
+#[test]
+fn grouped_strokes_scale_up_and_unchanged_size_is_a_noop() {
+    let (mut s, id) = shape_session(8);
+    s.edit("Group", |doc, _| {
+        let children = std::mem::take(&mut doc.layers);
+        doc.layers.push(photocraft_doc::Layer::group("Outer", vec![photocraft_doc::Layer::group("Inner", children)]));
+        Ok(())
+    })
+    .unwrap();
+    let original = &s.active().unwrap().doc;
+    for (width, expected) in [(1024, 32.0), (1280, 40.0), (256, 8.0)] {
+        let (scaled, _, _) = web_document(original, &json!({"width": width}), &WebSettings::default()).unwrap();
+        let LayerContent::Shape(sh) = &scaled.layer(id).unwrap().content else {
+            panic!("shape lost");
+        };
+        assert_eq!(sh.stroke.as_ref().unwrap().width, expected);
+    }
+}
+
+#[test]
+fn png_export_contains_the_scaled_stroke_and_keeps_the_source_document() {
+    let (mut s, _) = shape_session(8);
+    let before = s.active().unwrap().doc.clone();
+    let mut bytes = Vec::new();
+    photocraft_engine::web_cmds::save_for_web_with_writer(
+        &mut s,
+        &json!({"format": "png24", "path": "stroke.png", "width": 256, "height": 256}),
+        &mut |_, encoded| {
+            bytes = encoded.to_vec();
+            Ok(())
+        },
+    )
+    .unwrap();
+    let image = photocraft_codecs::decode(&bytes).unwrap().convert(photocraft_codecs::ChannelLayout::Rgba, photocraft_codecs::SampleType::U8);
+    assert_eq!(image.dimensions(), (256, 256));
+    let alpha = |x: usize| image.data()[(128 * 256 + x) * 4 + 3];
+    assert_eq!(alpha(62), 255);
+    assert_eq!(alpha(52), 0);
+    assert_eq!(alpha(128), 0);
+    assert_eq!(s.active().unwrap().doc, before);
+}
diff --git a/crates/engine/tests/xmp_charref.rs b/crates/engine/tests/xmp_charref.rs
new file mode 100644
index 0000000000..a4b98da4e5
--- /dev/null
+++ b/crates/engine/tests/xmp_charref.rs
@@ -0,0 +1,24 @@
+use photocraft_engine::file_cmds::read_file_info;
+
+#[test]
+fn numeric_character_references_are_decoded() {
+    let xmp = "<x:xmpmeta xmlns:x=\"adobe:ns:meta/\"><rdf:RDF><rdf:Description>\
+        <dc:description><rdf:Alt><rdf:li xml:lang=\"x-default\">Line one&#xA;Line two &#169; &#38; co &#x41; &amp;#38;</rdf:li></rdf:Alt></dc:description>\
+        </rdf:Description></rdf:RDF></x:xmpmeta>";
+    let info = read_file_info(Some(xmp));
+    assert_eq!(info["description"], "Line one\nLine two © & co A &#38;");
+}
+
+/// Many `&` with no `;` near them stay literal, and are scanned a bounded distance each (a
+/// multi-megabyte XMP once made this quadratic).
+#[test]
+fn a_long_run_of_ampersands_without_semicolons_is_left_unchanged() {
+    let run = "&".repeat(200_000);
+    let xmp = format!(
+        "<x:xmpmeta xmlns:x=\"adobe:ns:meta/\"><rdf:RDF><rdf:Description>\
+        <dc:description><rdf:Alt><rdf:li xml:lang=\"x-default\">{run}</rdf:li></rdf:Alt></dc:description>\
+        </rdf:Description></rdf:RDF></x:xmpmeta>"
+    );
+    let info = read_file_info(Some(&xmp));
+    assert_eq!(info["description"], run.as_str());
+}
diff --git a/crates/io/src/svg.rs b/crates/io/src/svg.rs
index 984dcdbc57..ac1bd27ffa 100644
--- a/crates/io/src/svg.rs
+++ b/crates/io/src/svg.rs
@@ -844,6 +844,64 @@ mod tests {
         assert!(r.warnings.iter().all(|w| !w.contains("font")), "{:?}", r.warnings);
     }
 
+    /// #4806: text placed by a `transform` (Illustrator writes `matrix(1 0 0 1 x y)` on every text
+    /// element), on the text or on a group around it, lands where resvg draws it. usvg leaves the
+    /// glyph outlines' absolute transforms at identity, so reading them dropped the transform: the
+    /// text went off the canvas or kept its untransformed place and size.
+    ///
+    /// Shaped with the bundled Inter alone, never a system font: on a machine without fonts (a
+    /// bare CI image or VM) the test would otherwise have nothing to check, and the drawing and
+    /// its reference come from the same parse, so both use that face.
+    #[test]
+    fn transformed_text_lands_where_resvg_draws_it() {
+        fn inter() -> Arc<usvg::fontdb::Database> {
+            let mut db = usvg::fontdb::Database::new();
+            db.load_font_data(photocraft_text::fonts::INTER_REGULAR.to_vec());
+            Arc::new(db)
+        }
+        assert!(inter().faces().next().is_some(), "the bundled Inter loads");
+        let font = r#"font-size="24" font-family="Inter" fill="black""#;
+        let cases = [
+            format!(r#"<text transform="translate(10 40)" {font}>IHI</text>"#),
+            format!(r#"<text transform="matrix(1 0 0 1 10 40)" {font}>IHI</text>"#),
+            format!(r#"<text transform="translate(10 0)" x="20" y="40" {font}>IHI</text>"#),
+            format!(r#"<text transform="scale(2)" x="5" y="25" {font}>IHI</text>"#),
+            format!(r#"<g transform="translate(10 40)"><text {font}>IHI</text></g>"#),
+            format!(r#"<g transform="translate(60 0)"><g transform="rotate(90)"><text x="5" y="20" {font}>IHI</text></g></g>"#),
+        ];
+        for c in cases {
+            let svg = format!(r#"<svg xmlns="http://www.w3.org/2000/svg" width="120" height="60">{c}</svg>"#);
+            let parsed = parse_with(svg.as_bytes(), inter).unwrap();
+            assert!(!parsed.fontless_text, "{c}");
+            let mut reference = tiny_skia::Pixmap::new(120, 60).unwrap();
+            resvg::render(&parsed.tree, tiny_skia::Transform::default(), &mut reference.as_mut());
+            let r = import_parsed("t", parsed, MAX_GROUP_DEPTH).unwrap();
+            let [layer] = r.document.layers.as_slice() else { panic!("one text layer, got {}: {c}", r.document.layers.len()) };
+            assert!(matches!(layer.content, LayerContent::Group(_)), "text stays outline shapes: {c}");
+            let imported = photocraft_compose::flatten(&r.document);
+            let (mut both, mut either) = (0usize, 0usize);
+            let (mut a_box, mut b_box) = ([i32::MAX, i32::MAX, i32::MIN, i32::MIN], [i32::MAX, i32::MAX, i32::MIN, i32::MIN]);
+            let grow = |bx: &mut [i32; 4], x: i32, y: i32| *bx = [bx[0].min(x), bx[1].min(y), bx[2].max(x), bx[3].max(y)];
+            for (i, px) in reference.pixels().iter().enumerate() {
+                let (x, y) = ((i % 120) as i32, (i / 120) as i32);
+                let (a, b) = (imported.get(x, y)[3] > 0.5, px.alpha() > 127);
+                if a {
+                    grow(&mut a_box, x, y);
+                }
+                if b {
+                    grow(&mut b_box, x, y);
+                }
+                both += usize::from(a && b);
+                either += usize::from(a || b);
+            }
+            assert!(either > 50, "resvg draws the text on the canvas: {c}");
+            // Same place and size to the pixel; the outlines are filled by a different rasteriser,
+            // so the edges of thin stems may differ by half a pixel.
+            assert!(a_box.iter().zip(b_box).all(|(a, b)| (a - b).abs() <= 1), "imported {a_box:?}, resvg {b_box:?}: {c}");
+            assert!(both * 10 >= either * 7, "imported glyphs cover what resvg draws ({both} of {either} px): {c}");
+        }
+    }
+
     /// #4266: a group clipped by one path (the PhotoCraft icon's rounded square) stays editable
     /// shapes with the clip as its vector mask, and looks as resvg draws the drawing; a clip of
     /// two shapes is still rasterised, with the warning.
diff --git a/crates/io/tests/flat.rs b/crates/io/tests/flat.rs
index b5cdadaac2..98833d45d5 100644
--- a/crates/io/tests/flat.rs
+++ b/crates/io/tests/flat.rs
@@ -1176,7 +1176,7 @@ fn a_lab_document_with_one_layer_is_not_reported_as_flattened() {
 fn a_stereo_png_keeps_its_stereo_mark_on_save() {
     use photocraft_codecs::{ChannelLayout, EncodeOptions, Format, Image, PngStereo, SampleType as CS};
     let img = Image::from_raw(4, 2, ChannelLayout::Rgb, CS::U8, vec![40u8; 24]).unwrap();
-    for view in [PngStereo::Horizontal, PngStereo::Vertical] {
+    for view in [PngStereo::CrossFuse, PngStereo::DivergingFuse] {
         let bytes = photocraft_codecs::encode(&img, Format::Png, &EncodeOptions { png_stereo: Some(view), ..Default::default() }).unwrap();
         let doc = import("stereo.png", &bytes).unwrap().document;
         assert_eq!(doc.file_encoding.png_stereo, Some(view.mode()));
diff --git a/crates/io/tests/svg.rs b/crates/io/tests/svg.rs
index 4f21bd5dcb..d1baf418fa 100644
--- a/crates/io/tests/svg.rs
+++ b/crates/io/tests/svg.rs
@@ -221,57 +221,6 @@ fn text_becomes_outline_shapes_or_warns_without_a_font() {
     assert!(dark > 4, "glyph strokes cross the middle row: {dark}");
 }
 
-/// #4806: text placed by a `transform` (Illustrator writes `matrix(1 0 0 1 x y)` on every text
-/// element), on the text or on a group around it, lands where resvg draws it. usvg leaves the
-/// glyph outlines' absolute transforms at identity, so reading them dropped the transform: the
-/// text went off the canvas or kept its untransformed place and size.
-#[test]
-fn transformed_text_lands_where_resvg_draws_it() {
-    let font = "font-size=\"24\" font-family=\"DejaVu Sans, Arial, Helvetica, sans-serif\" fill=\"black\"";
-    let cases = [
-        format!("<text transform=\"translate(10 40)\" {font}>IHI</text>"),
-        format!("<text transform=\"matrix(1 0 0 1 10 40)\" {font}>IHI</text>"),
-        format!("<text transform=\"translate(10 0)\" x=\"20\" y=\"40\" {font}>IHI</text>"),
-        format!("<text transform=\"scale(2)\" x=\"5\" y=\"25\" {font}>IHI</text>"),
-        format!("<g transform=\"translate(10 40)\"><text {font}>IHI</text></g>"),
-        format!("<g transform=\"translate(60 0)\"><g transform=\"rotate(90)\"><text x=\"5\" y=\"20\" {font}>IHI</text></g></g>"),
-    ];
-    for c in cases {
-        let svg = format!("<svg {NS} width=\"120\" height=\"60\">{c}</svg>");
-        let r = open(&svg);
-        let d = &r.document;
-        if d.layers.is_empty() {
-            // No font at all on this machine: the import says so instead.
-            assert!(r.warnings.iter().any(|w| w.contains("font")), "{:?}", r.warnings);
-            return;
-        }
-        assert!(matches!(d.layers[0].content, LayerContent::Group(_)), "text stays outline shapes: {c}");
-        let imported = photocraft_compose::flatten(d);
-        let reference = svg::rasterize(svg.as_bytes(), 1.0).unwrap();
-        let (mut both, mut either) = (0usize, 0usize);
-        let (mut a_box, mut b_box) = ([i32::MAX, i32::MAX, i32::MIN, i32::MIN], [i32::MAX, i32::MAX, i32::MIN, i32::MIN]);
-        let grow = |bx: &mut [i32; 4], x: i32, y: i32| *bx = [bx[0].min(x), bx[1].min(y), bx[2].max(x), bx[3].max(y)];
-        for y in 0..60 {
-            for x in 0..120 {
-                let (a, b) = (imported.get(x, y)[3] > 0.5, reference.get(x, y)[3] > 0.5);
-                if a {
-                    grow(&mut a_box, x, y);
-                }
-                if b {
-                    grow(&mut b_box, x, y);
-                }
-                both += usize::from(a && b);
-                either += usize::from(a || b);
-            }
-        }
-        assert!(either > 50, "resvg draws the text on the canvas: {c}");
-        // Same place and size to the pixel; the outlines are filled by a different rasteriser, so
-        // the edges of thin stems may differ by half a pixel.
-        assert!(a_box.iter().zip(b_box).all(|(a, b)| (a - b).abs() <= 1), "imported {a_box:?}, resvg {b_box:?}: {c}");
-        assert!(both * 10 >= either * 7, "imported glyphs cover what resvg draws ({both} of {either} px): {c}");
-    }
-}
-
 #[test]
 fn size_comes_from_the_viewbox_and_huge_drawings_shrink_to_fit() {
     let r = open(&format!("<svg {NS} viewBox=\"0 0 300 150\"><rect width=\"300\" height=\"150\"/></svg>"));
diff --git a/crates/ui-egui/src/export_dialog.rs b/crates/ui-egui/src/export_dialog.rs
index 5dc318228a..29ee74b1aa 100644
--- a/crates/ui-egui/src/export_dialog.rs
+++ b/crates/ui-egui/src/export_dialog.rs
@@ -129,10 +129,19 @@ pub fn open_layer(app: &mut PhotocraftApp, layer: photocraft_doc::LayerId) -> Re
     let ldoc = photocraft_engine::layer_menu_cmds::layer_document(&st.doc, layer).map_err(|e| e.to_string())?;
     let id = open(app)?;
     if let Some(d) = app.ui.dialogs.iter_mut().find(|d| d.id == id) {
-        d.fields.insert("__layer".into(), json!(layer.0));
-        d.fields.insert("__label".into(), json!(crate::i18n::fmt(crate::i18n::t("Export As: {name}"), &[("name", &ldoc.name)])));
-        d.fields.insert("__w".into(), json!(ldoc.size.width));
-        d.fields.insert("__h".into(), json!(ldoc.size.height));
+        let f = &mut d.fields;
+        f.insert("__layer".into(), json!(layer.0));
+        f.insert("__label".into(), json!(crate::i18n::fmt(crate::i18n::t("Export As: {name}"), &[("name", &ldoc.name)])));
+        f.insert("__w".into(), json!(ldoc.size.width));
+        f.insert("__h".into(), json!(ldoc.size.height));
+        // `open` seeded width and height from the document; in scale mode they follow the layer's
+        // trimmed size, so the dialog shows and edits the size the layer exports at. Exact pixels
+        // (sizing "pixels") are a size the user asked for, so those stay.
+        if s(f, "sizing") != "pixels"
+            && let Ok(size) = resize_from_scale(f64::from(ldoc.size.width), f64::from(ldoc.size.height), n(f, "scale", 100.0))
+        {
+            write_size(f, size, "scale");
+        }
     }
     Ok(id)
 }
@@ -565,6 +574,74 @@ fn estimate_native(doc: &Document, proxy: &Document, f: &Map<String, Value>) ->
     Some(scaled_estimate(bytes.len(), doc, proxy, f))
 }
 
+/// Exports up to this many pixels get an exact size: the full image encoded as Export will
+/// write it, as Photoshop's Export As reports (#6595). Larger ones keep the proxy estimate, which
+/// reads low for detailed images (a downscaled proxy compresses better).
+#[cfg(not(target_arch = "wasm32"))]
+const EXACT_ESTIMATE_PX: f64 = 40_000_000.0;
+
+/// The exported file's size in bytes, from encoding the full export, or `None` when it is too
+/// large to encode for an estimate or can't be encoded.
+#[cfg(not(target_arch = "wasm32"))]
+fn exact_estimate(doc: &Document, f: &Map<String, Value>) -> Option<u64> {
+    // The size `export_document` will make: exact pixels only in pixel mode, else the scale.
+    let (w, h) = export_pixels(f64::from(doc.size.width), f64::from(doc.size.height), f, None).ok()?;
+    let px = w * h;
+    if !px.is_finite() || px > EXACT_ESTIMATE_PX {
+        return None;
+    }
+    let full = export_document(doc, f, None).ok()?;
+    let bytes = photocraft_io::export(&full, &format!("estimate.{}", s_fmt(f)), &settings(f).io_options()).ok()?.bytes;
+    u64::try_from(bytes.len()).ok()
+}
+
+/// The exact size for `signature`, worked out off the UI thread: `None` until it is ready (the
+/// proxy estimate shows meanwhile), then `Some(None)` when there is no exact size.
+#[cfg(not(target_arch = "wasm32"))]
+fn poll_or_start_exact_estimate(ui: &mut egui::Ui, key: egui::Id, signature: &str, doc: Arc<Document>, fields: &Map<String, Value>) -> Option<Option<u64>> {
+    type Done = Arc<Mutex<Option<Option<u64>>>>;
+    let done_key = key.with("exact-estimate");
+    if let Some((sig, size)) = ui.data(|d| d.get_temp::<(String, Option<u64>)>(done_key))
+        && sig == signature
+    {
+        return Some(size);
+    }
+    let pending_key = key.with("exact-estimate-pending");
+    if let Some((sig, result)) = ui.data(|d| d.get_temp::<(String, Done)>(pending_key)) {
+        if sig == signature {
+            let size = result.lock().unwrap_or_else(std::sync::PoisonError::into_inner).take()?;
+            ui.data_mut(|d| {
+                d.remove::<(String, Done)>(pending_key);
+                d.insert_temp(done_key, (sig, size));
+            });
+            return Some(size);
+        }
+        // Settings changed meanwhile: that worker's answer is for other settings.
+        if result.lock().unwrap_or_else(std::sync::PoisonError::into_inner).is_none() {
+            return None;
+        }
+    }
+    let result: Done = Arc::new(Mutex::new(None));
+    let shared = result.clone();
+    let ctx = ui.ctx().clone();
+    let fields = fields.clone();
+    let started = std::thread::Builder::new().name("export-estimate".into()).spawn(move || {
+        let size = std::panic::catch_unwind(std::panic::AssertUnwindSafe(|| {
+            let source = source_document_from(doc.clone(), &fields).unwrap_or(doc);
+            exact_estimate(&source, &fields)
+        }))
+        .unwrap_or(None);
+        *shared.lock().unwrap_or_else(std::sync::PoisonError::into_inner) = Some(size);
+        ctx.request_repaint();
+    });
+    if started.is_ok() {
+        ui.data_mut(|d| d.insert_temp(pending_key, (signature.to_string(), result)));
+        None
+    } else {
+        Some(None)
+    }
+}
+
 fn write_size(f: &mut Map<String, Value>, size: ExportSize, sizing: &str) {
     f.insert("width".into(), json!(size.width));
     f.insert("height".into(), json!(size.height));
@@ -884,7 +961,7 @@ pub fn body(app: &mut PhotocraftApp, ui: &mut egui::Ui, f: &mut Map<String, Valu
                         Some(preview_sync(app, &source, f))
                     };
                     let filter = preview_filter(f);
-                    result.map(|result| cache_preview(ui, key, sig, result, filter))
+                    result.map(|result| cache_preview(ui, key, sig.clone(), result, filter))
                 }
             };
             let side = 300.0;
@@ -901,7 +978,12 @@ pub fn body(app: &mut PhotocraftApp, ui: &mut egui::Ui, f: &mut Map<String, Valu
                 ui.painter().text(r.center(), egui::Align2::CENTER_CENTER, tl!("Preview"), egui::FontId::proportional(12.0), t.text_dim);
             }
             ui.painter().rect_stroke(r, 0.0, egui::Stroke::new(1.0, t.separator), egui::StrokeKind::Outside);
-            let est = preview.as_ref().and_then(|preview| preview.estimate).map_or("—".to_string(), |b| crate::sizing::human_bytes(b as f64));
+            #[cfg(not(target_arch = "wasm32"))]
+            let exact = poll_or_start_exact_estimate(ui, key, &sig, doc.clone(), f).flatten();
+            #[cfg(target_arch = "wasm32")]
+            let exact: Option<u64> = None;
+            let est =
+                exact.or_else(|| preview.as_ref().and_then(|preview| preview.estimate)).map_or("—".to_string(), |b| crate::sizing::human_bytes(b as f64));
             ui.label(egui::RichText::new(format!("{}  ≈ {est}", s_fmt(f).to_uppercase())).color(t.text_dim).size(11.5));
         });
     });
@@ -1113,6 +1195,33 @@ mod tests {
         }
     }
 
+    /// Layer › Export As opens with the layer's trimmed size, not the document's: `open` seeds the
+    /// size fields from the document, and the layer replaces them in scale mode. A remembered
+    /// percent scales the layer; remembered exact pixels stay the size the user asked for.
+    #[test]
+    fn layer_export_as_opens_with_the_layer_size() {
+        let mut app = PhotocraftApp::new(photocraft_engine::Session::new(), crate::Services::default());
+        app.run("file.new", json!({"width": 40, "height": 30})).unwrap();
+        app.run("layer.new.layer", json!({})).unwrap();
+        app.run("select.rect", json!({"x": 4, "y": 2, "width": 10, "height": 6})).unwrap();
+        app.run("edit.fill", json!({"color": "#ff0000"})).unwrap();
+        let layer = app.session.active().unwrap().active_layer.unwrap();
+        let id = open_layer(&mut app, layer).unwrap();
+        let f = &app.ui.dialog_mut(id).unwrap().fields;
+        assert_eq!((f["__w"].as_f64(), f["__h"].as_f64()), (Some(10.0), Some(6.0)));
+        assert_eq!((f["width"].as_f64(), f["height"].as_f64()), (Some(10.0), Some(6.0)));
+
+        app.session.prefs.edit(|p| p.dialogs.insert(COMMAND.into(), json!({"scale": 50})));
+        let id = open_layer(&mut app, layer).unwrap();
+        let f = &app.ui.dialog_mut(id).unwrap().fields;
+        assert_eq!((f["width"].as_f64(), f["height"].as_f64()), (Some(5.0), Some(3.0)));
+
+        app.session.prefs.edit(|p| p.dialogs.insert(COMMAND.into(), json!({"sizing": "pixels", "width": 120, "height": 80})));
+        let id = open_layer(&mut app, layer).unwrap();
+        let f = &app.ui.dialog_mut(id).unwrap().fields;
+        assert_eq!((f["width"].as_f64(), f["height"].as_f64()), (Some(120.0), Some(80.0)));
+    }
+
     /// Only the dialog's own settings are remembered: not the destination, the document size or
     /// the layer the dialog was opened with.
     #[test]
@@ -1284,6 +1393,116 @@ mod tests {
         }
     }
 
+    /// #6595: Export As shows the size the file will have, as Photoshop does. The proxy estimate
+    /// read 36–81 % of it for a detailed image; up to `EXACT_ESTIMATE_PX` the full export is
+    /// encoded off the UI thread instead.
+    #[test]
+    fn the_estimate_is_the_exported_files_size() {
+        let mut doc = Document::with_background(
+            "x",
+            photocraft_doc::Size::new(900, 300),
+            photocraft_doc::ColorMode::Rgb,
+            photocraft_doc::SampleType::U8,
+            photocraft_doc::Color::WHITE,
+        );
+        let id = doc.layers[0].id;
+        let surf = doc.layer_mut(id).unwrap().surface_mut().unwrap();
+        let mut seed = 12345u32;
+        for y in (0..300).step_by(2) {
+            for x in (0..900).step_by(2) {
+                seed = seed.wrapping_mul(1664525).wrapping_add(1013904223);
+                let v = (seed >> 24) as f32 / 255.0;
+                surf.fill_rect(photocraft_geom::Rect::new(x, y, x + 2, y + 2), &[v, x as f32 / 900.0, y as f32 / 300.0, 1.0]);
+            }
+        }
+        let doc = Arc::new(doc);
+        let f = Map::from_iter([("format".into(), json!("jpg")), ("scale".into(), json!(100)), ("quality".into(), json!(32))]);
+        let actual = photocraft_io::export(&export_document(&doc, &f, None).unwrap(), "x.jpg", &settings(&f).io_options()).unwrap().bytes.len() as u64;
+        let proxy = preview_proxy(&doc, &f).unwrap();
+        let old = estimate_native(&doc, &proxy, &f).unwrap();
+        assert!((old as f64 / actual as f64 - 1.0).abs() > 0.1, "the proxy estimate was off: {old} vs {actual}");
+
+        let ctx = egui::Context::default();
+        let key = egui::Id::new("exact-estimate-test");
+        let deadline = std::time::Instant::now() + std::time::Duration::from_secs(20);
+        let size = loop {
+            let mut size = None;
+            let mut output = ctx.run_ui(Default::default(), |ctx| {
+                egui::CentralPanel::default().show(ctx, |ui| size = poll_or_start_exact_estimate(ui, key, "jpg32", doc.clone(), &f));
+            });
+            output.textures_delta.clear();
+            if let Some(size) = size {
+                break size;
+            }
+            assert!(std::time::Instant::now() < deadline, "the exact estimate did not arrive");
+            std::thread::sleep(std::time::Duration::from_millis(10));
+        };
+        assert_eq!(size, Some(actual));
+        // Over the limit there is no exact size; the proxy estimate stays.
+        let huge = Map::from_iter([
+            ("format".into(), json!("jpg")),
+            ("sizing".into(), json!("pixels")),
+            ("width".into(), json!(10_000)),
+            ("height".into(), json!(10_000)),
+        ]);
+        assert_eq!(exact_estimate(&doc, &huge), None);
+        // In scale mode the size comes from the scale, as the export's does, not from stale pixels.
+        let big = Arc::new(Document::with_background(
+            "big",
+            photocraft_doc::Size::new(1000, 1000),
+            photocraft_doc::ColorMode::Rgb,
+            photocraft_doc::SampleType::U8,
+            photocraft_doc::Color::WHITE,
+        ));
+        let stale = Map::from_iter([
+            ("format".into(), json!("png")),
+            ("sizing".into(), json!("scale")),
+            ("scale".into(), json!(1000)),
+            ("width".into(), json!(100)),
+            ("height".into(), json!(100)),
+        ]);
+        assert_eq!(exact_estimate(&big, &stale), None, "10000 × 10000 at 1000 %, over the limit");
+        let small = Map::from_iter([
+            ("format".into(), json!("png")),
+            ("sizing".into(), json!("scale")),
+            ("scale".into(), json!(10)),
+            ("width".into(), json!(9000)),
+            ("height".into(), json!(9000)),
+        ]);
+        let at_10 = photocraft_io::export(&export_document(&big, &small, None).unwrap(), "x.png", &settings(&small).io_options()).unwrap().bytes.len() as u64;
+        assert_eq!(exact_estimate(&big, &small), Some(at_10), "100 × 100 at 10 %, within it");
+    }
+
+    /// #8341: Export As and its reduced preview carry the stroke width with the path.
+    #[test]
+    fn export_as_downscales_stroke_only_shapes_and_preview() {
+        for depth in [8, 16, 32] {
+            let mut session = photocraft_engine::Session::new();
+            session.execute("file.new", json!({"width": 1024, "height": 1024, "depth": depth, "background": "transparent"})).unwrap();
+            let id = session.execute("shape.create", json!({"rect": [256, 256, 512, 512], "fill": null, "stroke": {"width": 32}})).unwrap()["layer"]
+                .as_u64()
+                .unwrap();
+            let doc = session.active().unwrap().doc.clone();
+            let fields = Map::from_iter([("format".into(), json!("png")), ("scale".into(), json!(25))]);
+            for limit in [None, Some(128)] {
+                let out = export_document(&doc, &fields, limit).unwrap();
+                let side = if limit.is_some() { 128 } else { 256 };
+                assert_eq!((out.size.width, out.size.height), (side, side));
+                let shape = out.layer(photocraft_doc::LayerId(id)).unwrap();
+                let photocraft_doc::LayerContent::Shape(shape) = &shape.content else {
+                    panic!("shape lost");
+                };
+                assert_eq!(shape.stroke.as_ref().unwrap().width, side as f32 / 32.0);
+                let pixels = photocraft_compose::flatten(&out);
+                let row = (side / 2 * side) as usize;
+                assert!(pixels.px[row + (side / 4) as usize][3] > 0.99);
+                assert!(pixels.px[row + (side / 4 - side / 32) as usize][3] < 0.01);
+                assert!(pixels.px[row + (side / 2) as usize][3] < 0.01);
+            }
+            assert_eq!(session.active().unwrap().doc, doc, "export leaves the source unchanged");
+        }
+    }
+
     #[test]
     fn export_document_scales_and_flattens() {
         let doc = Document::with_background(
diff --git a/crates/ui-egui/src/file_dialog.rs b/crates/ui-egui/src/file_dialog.rs
index c7ac09dbc7..bddc6796d3 100644
--- a/crates/ui-egui/src/file_dialog.rs
+++ b/crates/ui-egui/src/file_dialog.rs
@@ -46,8 +46,9 @@ pub enum FileDialogAnswer {
     SaveTo(String),
     /// The selected folder's path (desktop).
     FolderTo(String),
-    /// No dialog could be shown (on Linux: no desktop portal and no zenity, #3354); the message
-    /// says what to install. Reported as an error rather than taken for Cancel.
+    /// No dialog could be shown (on Linux: no desktop portal and no zenity, #3354; the message
+    /// says what to install), or the file chosen can't be used (a name that isn't valid Unicode,
+    /// #6601). Reported as an error rather than taken for Cancel.
     Unavailable(String),
 }
 
diff --git a/crates/ui-egui/src/file_dialog/tests.rs b/crates/ui-egui/src/file_dialog/tests.rs
index b7df1d9fde..62eab8b49e 100644
--- a/crates/ui-egui/src/file_dialog/tests.rs
+++ b/crates/ui-egui/src/file_dialog/tests.rs
@@ -1070,6 +1070,45 @@ fn same_folder_quick_export_asks_before_replacing_the_documents_own_file() {
     std::fs::remove_dir_all(&dir).ok();
 }
 
+/// #6597: once Save As or Save a Copy writes over the file another open document is bound to,
+/// that document no longer has the file and reads as unsaved (so closing it asks, and its Save
+/// asks for a name), and a notice says so. Documents bound to other files are left alone.
+#[test]
+fn saving_over_the_file_of_another_open_document_detaches_it() {
+    let dir = std::env::temp_dir().join(format!("photocraft-save-over-tab-{}", std::process::id()));
+    let (a, d) = (dir.join("a.psd").to_string_lossy().into_owned(), dir.join("d.psd").to_string_lossy().into_owned());
+    let (mut app, open, written) = app();
+    let saved_as = |app: &mut PhotocraftApp, path: &str| {
+        let st = app.session.active_mut().unwrap();
+        st.path = Some(path.to_string());
+        st.saved_revision = st.revision;
+    };
+    // A lives in a.psd and D in d.psd, both saved.
+    saved_as(&mut app, &a);
+    app.run("file.new", json!({"width": 4, "height": 4})).unwrap();
+    saved_as(&mut app, &d);
+    // B, in another tab, is saved as a.psd.
+    app.run("file.new", json!({"width": 4, "height": 4})).unwrap();
+    app.save_as(Some(a.clone())).unwrap();
+    let docs = app.session.documents();
+    assert_eq!((docs[0].path.as_deref(), docs[0].is_dirty()), (None, true), "A lost a.psd and is unsaved");
+    assert_eq!((docs[1].path.as_deref(), docs[1].is_dirty()), (Some(d.as_str()), false), "D is untouched");
+    assert_eq!(docs[2].path.as_deref(), Some(a.as_str()), "B lives in a.psd");
+    let notice = app.ui.notices.last().expect("a notice");
+    assert!(notice.title.contains("a.psd was saved over") && notice.lines.len() == 1, "{} {:?}", notice.title, notice.lines);
+    // C's Save a Copy onto a.psd detaches B the same way, and C doesn't take the file.
+    app.run("file.new", json!({"width": 4, "height": 4})).unwrap();
+    let ctx = egui::Context::default();
+    menus::invoke(&mut app, &ctx, "file.saveACopy", json!({})).unwrap();
+    app.poll_file_dialog(&ctx, None);
+    answer(&open, Some(FileDialogAnswer::SaveTo(a.clone())));
+    app.poll_file_dialog(&ctx, None);
+    let docs = app.session.documents();
+    assert_eq!((docs[2].path.as_deref(), docs[2].is_dirty()), (None, true), "B lost a.psd and is unsaved");
+    assert_eq!(docs[3].path, None, "a copy doesn't bind C to a.psd");
+    assert_eq!(*written.borrow(), [a.clone(), a]);
+}
+
 #[test]
 fn cancelling_multi_layer_quick_export_writes_nothing() {
     let (mut app, open, written) = app();
diff --git a/crates/ui-egui/src/file_open.rs b/crates/ui-egui/src/file_open.rs
index 1cf61e98d3..19d8819e33 100644
--- a/crates/ui-egui/src/file_open.rs
+++ b/crates/ui-egui/src/file_open.rs
@@ -68,6 +68,21 @@ fn dropped_name(f: &egui::DroppedFileHandle) -> String {
     f.path().file_name().map(|n| n.to_string_lossy().to_string()).unwrap_or_else(|| "dropped".into())
 }
 
+/// `path` as the `String` file paths are carried in, or what to tell the user when its name isn't
+/// valid Unicode (#6601): non-UTF-8 bytes on Linux, an unpaired surrogate on Windows. A lossy copy
+/// would name another file, so Open would fail with "No such file" and Save would write a second,
+/// renamed file beside the original. `saving`: the path is to be written to.
+pub fn path_text(path: &std::path::Path, saving: bool) -> Result<String, String> {
+    path.to_str().map(str::to_owned).ok_or_else(|| {
+        let line = if saving {
+            tl!("{path}: the path is not valid Unicode; save under another name.")
+        } else {
+            tl!("{path}: the path is not valid Unicode; rename the file and open it again.")
+        };
+        crate::i18n::fmt(line, &[("path", &path.to_string_lossy())])
+    })
+}
+
 /// The file name of `path` (the document's display name), or `path` itself when it has none.
 pub fn display_name(path: &str) -> String {
     std::path::Path::new(path).file_name().map(|n| n.to_string_lossy().to_string()).filter(|n| !n.is_empty()).unwrap_or_else(|| path.to_string())
@@ -270,7 +285,7 @@ impl PhotocraftApp {
         // Opens append: a background open's tab, or a document.
         let (docs, opens) = (self.session.documents().len(), self.jobs.opens.len());
         if f.path().is_absolute() {
-            self.open_path(&f.path().to_string_lossy())?;
+            self.open_path(&path_text(f.path(), false)?)?;
         } else {
             self.open_bytes(name, &crate::read_dropped(&**f)?)?;
         }
@@ -289,7 +304,7 @@ impl PhotocraftApp {
             let Some(next) = self.drop_places.pop_front() else { return };
             let (name, placed) = match next {
                 DropPlace::File(f) if f.path().is_absolute() => {
-                    (dropped_name(&f), self.run("file.placeEmbedded", serde_json::json!({"path": f.path().to_string_lossy()})))
+                    (dropped_name(&f), path_text(f.path(), false).and_then(|path| self.run("file.placeEmbedded", serde_json::json!({"path": path}))))
                 }
                 DropPlace::File(f) => {
                     let name = dropped_name(&f);
diff --git a/crates/ui-egui/src/file_open/tests.rs b/crates/ui-egui/src/file_open/tests.rs
index 93b8db2906..84db932180 100644
--- a/crates/ui-egui/src/file_open/tests.rs
+++ b/crates/ui-egui/src/file_open/tests.rs
@@ -1002,6 +1002,37 @@ fn opening_type_in_a_missing_font_warns() {
     assert_eq!(app.open_bytes("warned.psd", b"x").unwrap(), vec![warning]);
 }
 
+/// A file name that isn't valid Unicode on this platform: non-UTF-8 bytes on Unix, an unpaired
+/// surrogate on Windows.
+fn non_unicode_path() -> std::path::PathBuf {
+    #[cfg(unix)]
+    let name = {
+        use std::os::unix::ffi::OsStrExt;
+        std::ffi::OsStr::from_bytes(b"img\xFF.png").to_owned()
+    };
+    #[cfg(windows)]
+    let name = {
+        use std::os::windows::ffi::OsStringExt;
+        let mut wide: Vec<u16> = "img".encode_utf16().collect();
+        wide.push(0xD800);
+        wide.extend(".png".encode_utf16());
+        std::ffi::OsString::from_wide(&wide)
+    };
+    std::env::temp_dir().join(name)
+}
+
+/// #6601: a lossy copy of such a name is another file's name, so it is refused instead.
+#[test]
+fn a_path_that_is_not_valid_unicode_is_refused_not_rewritten() {
+    let bad = non_unicode_path();
+    let open = path_text(&bad, false).unwrap_err();
+    assert!(open.contains("not valid Unicode") && open.contains("open it again"), "{open}");
+    let save = path_text(&bad, true).unwrap_err();
+    assert!(save.contains("not valid Unicode") && save.contains("another name"), "{save}");
+    let good = std::env::temp_dir().join("img é.png");
+    assert_eq!(path_text(&good, true).as_deref(), Ok(good.to_str().unwrap()));
+}
+
 /// #6598: opening a file that is already open shows its document, as Photoshop does, rather than
 /// a second copy bound to the same file (saving one would overwrite the other). The path is
 /// compared as the file it names: another spelling of it, a symlink to it or, with background
diff --git a/crates/ui-egui/src/i18n/cs.tsv b/crates/ui-egui/src/i18n/cs.tsv
index f3b756ed5e..fe282c85db 100644
--- a/crates/ui-egui/src/i18n/cs.tsv
+++ b/crates/ui-egui/src/i18n/cs.tsv
@@ -3903,6 +3903,7 @@ navigator	Zoom	Zvětšení
 	This document's layers: {needed} of {budget} for layers	Vrstvy tohoto dokumentu: {needed} z {budget} pro vrstvy
 	This document's layers need {needed} but may hold {budget}: whole-document redraws use the CPU	Vrstvy tohoto dokumentu potřebují {needed}, ale mohou zabrat {budget}: překreslení celého dokumentu probíhá na CPU
 	GPU Memory (MB, 0 = Automatic)	Paměť GPU (MB, 0 = Automaticky)
+	{path}: the path is not valid Unicode; save under another name.	{path}: cesta není platný Unicode; uložte soubor pod jiným názvem.
 	{name} was changed by another app after it was opened or saved here.	Soubor {name} změnila jiná aplikace poté, co byl zde otevřen nebo uložen.
 	Replace it with this document, or cancel and use File › Save As to keep both.	Nahraďte ho tímto dokumentem, nebo zrušte a použijte Soubor › Uložit jako, abyste zachovali obojí.
 	Decrease Brush Size	Zmenšit velikost štětce
@@ -3946,3 +3947,5 @@ navigator	Zoom	Zvětšení
 	Pro Light Gray	Pro (světle šedý)
 	Pro Light	Pro (světlý)
 	Resize Windows to Fit	Přizpůsobit velikost oken
+
+	EXR	EXR
diff --git a/crates/ui-egui/src/i18n/de.tsv b/crates/ui-egui/src/i18n/de.tsv
index 36804daec0..f24e5f6fb1 100644
--- a/crates/ui-egui/src/i18n/de.tsv
+++ b/crates/ui-egui/src/i18n/de.tsv
@@ -3303,6 +3303,7 @@ curves	Smooth	Glätten
 	This document's layers: {needed} of {budget} for layers	Ebenen dieses Dokuments: {needed} von {budget} für Ebenen
 	This document's layers need {needed} but may hold {budget}: whole-document redraws use the CPU	Die Ebenen dieses Dokuments brauchen {needed}, dürfen aber {budget} belegen: Das ganze Dokument wird auf der CPU neu gezeichnet
 	GPU Memory (MB, 0 = Automatic)	GPU-Speicher (MB, 0 = Automatisch)
+	{path}: the path is not valid Unicode; save under another name.	{path}: Der Dateipfad enthält ungültige Zeichen. Speichere unter einem anderen Namen.
 	{name} was changed by another app after it was opened or saved here.	{name} wurde von einer anderen App geändert, nachdem es hier geöffnet oder gespeichert wurde.
 	Replace it with this document, or cancel and use File › Save As to keep both.	Ersetze die Datei durch dieses Dokument oder brich ab und nutze Datei › Speichern unter, um beide zu behalten.
 	Demosaic	Demosaicing
@@ -3344,3 +3345,5 @@ curves	Smooth	Glätten
 	Pro Light Gray	Pro (Hellgrau)
 	Pro Light	Pro (Hell)
 	Resize Windows to Fit	Fenstergröße anpassen
+
+	EXR	EXR
diff --git a/crates/ui-egui/src/i18n/el.tsv b/crates/ui-egui/src/i18n/el.tsv
index e081c17e96..0451778f60 100644
--- a/crates/ui-egui/src/i18n/el.tsv
+++ b/crates/ui-egui/src/i18n/el.tsv
@@ -3992,6 +3992,7 @@ curves	Smooth	Εξομάλυνση
 	This document's layers: {needed} of {budget} for layers	Επίπεδα αυτού του εγγράφου: {needed} από {budget} για επίπεδα
 	This document's layers need {needed} but may hold {budget}: whole-document redraws use the CPU	Τα επίπεδα αυτού του εγγράφου χρειάζονται {needed} αλλά μπορούν να καταλάβουν {budget}: η επανασχεδίαση όλου του εγγράφου γίνεται στη CPU
 	GPU Memory (MB, 0 = Automatic)	Μνήμη GPU (MB, 0 = Αυτόματο)
+	{path}: the path is not valid Unicode; save under another name.	{path}: η διαδρομή δεν είναι έγκυρο Unicode· αποθηκεύστε με άλλο όνομα.
 	{name} was changed by another app after it was opened or saved here.	Το {name} άλλαξε από άλλη εφαρμογή αφού ανοίχτηκε ή αποθηκεύτηκε εδώ.
 	Replace it with this document, or cancel and use File › Save As to keep both.	Αντικαταστήστε το με αυτό το έγγραφο ή ακυρώστε και χρησιμοποιήστε Αρχείο › Αποθήκευση ως για να κρατήσετε και τα δύο.
 	Decrease Brush Size	Μείωση μεγέθους πινέλου
@@ -4035,3 +4036,5 @@ curves	Smooth	Εξομάλυνση
 	Pro Light Gray	Pro ανοιχτού γκρι
 	Pro Light	Φωτεινό Pro
 	Resize Windows to Fit	Προσαρμογή μεγέθους παραθύρων
+
+	EXR	EXR
diff --git a/crates/ui-egui/src/i18n/es.tsv b/crates/ui-egui/src/i18n/es.tsv
index 0424d0af5b..c9a138a313 100644
--- a/crates/ui-egui/src/i18n/es.tsv
+++ b/crates/ui-egui/src/i18n/es.tsv
@@ -4254,6 +4254,7 @@ navigator	Zoom	Zoom
 	This document's layers: {needed} of {budget} for layers	Capas de este documento: {needed} de {budget} para capas
 	This document's layers need {needed} but may hold {budget}: whole-document redraws use the CPU	Las capas de este documento necesitan {needed} pero pueden ocupar {budget}: los redibujados de todo el documento usan la CPU
 	GPU Memory (MB, 0 = Automatic)	Memoria de GPU (MB, 0 = Automático)
+	{path}: the path is not valid Unicode; save under another name.	{path}: la ruta no es Unicode válido; guarde con otro nombre.
 	{name} was changed by another app after it was opened or saved here.	Otra aplicación cambió {name} después de abrirlo o guardarlo aquí.
 	Replace it with this document, or cancel and use File › Save As to keep both.	Reemplázalo con este documento, o cancela y usa Archivo › Guardar como para conservar ambos.
 	Decrease Brush Size	Reducir tamaño del pincel
@@ -4297,3 +4298,5 @@ navigator	Zoom	Zoom
 	Pro Light Gray	Pro (gris claro)
 	Pro Light	Pro (claro)
 	Resize Windows to Fit	Redimensionar ventanas para ajustar
+
+	EXR	EXR
diff --git a/crates/ui-egui/src/i18n/fr.tsv b/crates/ui-egui/src/i18n/fr.tsv
index d58b16f561..d5df62d148 100644
--- a/crates/ui-egui/src/i18n/fr.tsv
+++ b/crates/ui-egui/src/i18n/fr.tsv
@@ -3301,6 +3301,7 @@ curves	Smooth	Lisser
 	This document's layers: {needed} of {budget} for layers	Calques de ce document : {needed} sur {budget} pour les calques
 	This document's layers need {needed} but may hold {budget}: whole-document redraws use the CPU	Les calques de ce document ont besoin de {needed} mais peuvent occuper {budget} : le document entier se redessine sur le CPU
 	GPU Memory (MB, 0 = Automatic)	Mémoire GPU (Mo, 0 = Automatique)
+	{path}: the path is not valid Unicode; save under another name.	{path} : le chemin n’est pas un Unicode valide ; enregistrez sous un autre nom.
 	Replace	Remplacer
 	{name} was changed by another app after it was opened or saved here.	{name} a été modifié par une autre application après avoir été ouvert ou enregistré ici.
 	Replace it with this document, or cancel and use File › Save As to keep both.	Remplacez-le par ce document, ou annulez et utilisez Fichier › Enregistrer sous pour garder les deux.
@@ -3346,3 +3347,5 @@ curves	Smooth	Lisser
 	Pro Light Gray	Pro gris clair
 	Pro Light	Pro clair
 	Resize Windows to Fit	Redimensionner les fenêtres
+
+	EXR	EXR
diff --git a/crates/ui-egui/src/i18n/hu.tsv b/crates/ui-egui/src/i18n/hu.tsv
index 754e4f21ba..286ce41f0a 100644
--- a/crates/ui-egui/src/i18n/hu.tsv
+++ b/crates/ui-egui/src/i18n/hu.tsv
@@ -4209,6 +4209,7 @@ cameraRaw	Yellow	Sárga
 	This document's layers: {needed} of {budget} for layers	A dokumentum rétegei: {needed} / {budget} a rétegeknek
 	This document's layers need {needed} but may hold {budget}: whole-document redraws use the CPU	A dokumentum rétegeinek {needed} kell, de {budget} foglalhatnak: a teljes dokumentum újrarajzolása a CPU-n fut
 	GPU Memory (MB, 0 = Automatic)	GPU-memória (MB, 0 = Automatikus)
+	{path}: the path is not valid Unicode; save under another name.	{path}: az elérési út nem érvényes Unicode-szöveg. Mentsd más néven.
 	{name} was changed by another app after it was opened or saved here.	A(z) {name} fájlt egy másik alkalmazás módosította, miután itt megnyitották vagy mentették.
 	Replace it with this document, or cancel and use File › Save As to keep both.	Cserélje le erre a dokumentumra, vagy válassza a Mégse gombot, és a Fájl › Mentés másként paranccsal tartsa meg mindkettőt.
 	Decrease Brush Size	Ecsetméret csökkentése
@@ -4252,3 +4253,5 @@ cameraRaw	Yellow	Sárga
 	Pro Light Gray	Pro világosszürke
 	Pro Light	Pro világos
 	Resize Windows to Fit	Ablakok átméretezése a képhez
+
+	EXR	EXR
diff --git a/crates/ui-egui/src/i18n/id.tsv b/crates/ui-egui/src/i18n/id.tsv
index 8cdc09e1f1..1fe7c32b24 100644
--- a/crates/ui-egui/src/i18n/id.tsv
+++ b/crates/ui-egui/src/i18n/id.tsv
@@ -3304,6 +3304,7 @@ curves	Smooth	Haluskan
 	This document's layers: {needed} of {budget} for layers	Layer dokumen ini: {needed} dari {budget} untuk layer
 	This document's layers need {needed} but may hold {budget}: whole-document redraws use the CPU	Layer dokumen ini membutuhkan {needed} tetapi boleh memakai {budget}: penggambaran ulang seluruh dokumen memakai CPU
 	GPU Memory (MB, 0 = Automatic)	Memori GPU (MB, 0 = Otomatis)
+	{path}: the path is not valid Unicode; save under another name.	{path}: jalur bukan Unicode yang valid; simpan dengan nama lain.
 	Replace	Ganti
 	{name} was changed by another app after it was opened or saved here.	{name} diubah oleh aplikasi lain setelah dibuka atau disimpan di sini.
 	Replace it with this document, or cancel and use File › Save As to keep both.	Ganti dengan dokumen ini, atau batalkan dan gunakan Berkas › Simpan Sebagai untuk menyimpan keduanya.
@@ -3349,3 +3350,5 @@ curves	Smooth	Haluskan
 	Pro Light Gray	Pro Abu-abu Terang
 	Pro Light	Pro Terang
 	Resize Windows to Fit	Ubah ukuran jendela agar pas
+
+	EXR	EXR
diff --git a/crates/ui-egui/src/i18n/it.tsv b/crates/ui-egui/src/i18n/it.tsv
index e9b85c84ce..3750f43092 100644
--- a/crates/ui-egui/src/i18n/it.tsv
+++ b/crates/ui-egui/src/i18n/it.tsv
@@ -4413,6 +4413,7 @@ shape	Appearance	Aspetto
 	This document's layers: {needed} of {budget} for layers	Livelli di questo documento: {needed} su {budget} per i livelli
 	This document's layers need {needed} but may hold {budget}: whole-document redraws use the CPU	I livelli di questo documento richiedono {needed} ma possono occupare {budget}: i ridisegni dell'intero documento usano la CPU
 	GPU Memory (MB, 0 = Automatic)	Memoria GPU (MB, 0 = Automatico)
+	{path}: the path is not valid Unicode; save under another name.	{path}: il percorso non è Unicode valido; salva con un altro nome.
 	{name} was changed by another app after it was opened or saved here.	{name} è stato modificato da un'altra app dopo essere stato aperto o salvato qui.
 	Replace it with this document, or cancel and use File › Save As to keep both.	Sostituiscilo con questo documento, oppure annulla e usa File › Salva con nome per tenerli entrambi.
 	Demosaic	Demosaicizzazione
@@ -4452,3 +4453,5 @@ shape	Appearance	Aspetto
 	Pro Light Gray	Pro grigio chiaro
 	Pro Light	Pro chiaro
 	Resize Windows to Fit	Ridimensiona finestre per adattare
+
+	EXR	EXR
diff --git a/crates/ui-egui/src/i18n/ja.tsv b/crates/ui-egui/src/i18n/ja.tsv
index 6c321e10af..dcc8b0aa10 100644
--- a/crates/ui-egui/src/i18n/ja.tsv
+++ b/crates/ui-egui/src/i18n/ja.tsv
@@ -3968,6 +3968,7 @@ curves	Smooth	スムーズ
 	This document's layers: {needed} of {budget} for layers	このドキュメントのレイヤー: レイヤー用 {budget} のうち {needed}
 	This document's layers need {needed} but may hold {budget}: whole-document redraws use the CPU	このドキュメントのレイヤーには {needed} が必要ですが、使えるのは {budget} です: ドキュメント全体の再描画は CPU で行われます
 	GPU Memory (MB, 0 = Automatic)	GPU メモリ（MB、0 = 自動）
+	{path}: the path is not valid Unicode; save under another name.	{path}: パスが有効な Unicode ではありません。別の名前で保存してください。
 	Replace	置き換え
 	{name} was changed by another app after it was opened or saved here.	{name} は、ここで開くか保存した後に別のアプリで変更されました。
 	Replace it with this document, or cancel and use File › Save As to keep both.	この書類で置き換えるか、キャンセルしてファイル › 名前を付けて保存で両方を残してください。
@@ -4013,3 +4014,5 @@ curves	Smooth	スムーズ
 	Pro Light Gray	プロ(ライトグレー)
 	Pro Light	プロ(ライト)
 	Resize Windows to Fit	ウィンドウサイズを合わせる
+
+	EXR	EXR
diff --git a/crates/ui-egui/src/i18n/ko.tsv b/crates/ui-egui/src/i18n/ko.tsv
index 5f048fcbd1..bff7a0e69c 100644
--- a/crates/ui-egui/src/i18n/ko.tsv
+++ b/crates/ui-egui/src/i18n/ko.tsv
@@ -3496,6 +3496,7 @@ curves	Smooth	매끄럽게
 	This document's layers: {needed} of {budget} for layers	이 문서의 레이어: 레이어용 {budget} 중 {needed}
 	This document's layers need {needed} but may hold {budget}: whole-document redraws use the CPU	이 문서의 레이어에 {needed}가 필요하지만 {budget}만 사용할 수 있습니다: 문서 전체 다시 그리기는 CPU를 사용합니다
 	GPU Memory (MB, 0 = Automatic)	GPU 메모리(MB, 0 = 자동)
+	{path}: the path is not valid Unicode; save under another name.	{path}: 경로가 올바른 유니코드가 아닙니다. 다른 이름으로 저장하세요.
 	Replace	대치
 	{name} was changed by another app after it was opened or saved here.	{name}이(가) 여기서 열거나 저장한 뒤 다른 앱에서 변경되었습니다.
 	Replace it with this document, or cancel and use File › Save As to keep both.	이 문서로 대치하거나, 취소하고 파일 › 다른 이름으로 저장을 사용해 둘 다 보관하세요.
@@ -3542,3 +3543,5 @@ curves	Smooth	매끄럽게
 	Pro Light Gray	프로 밝은 회색
 	Pro Light	프로 밝게
 	Resize Windows to Fit	창 크기 맞추기
+
+	EXR	EXR
diff --git a/crates/ui-egui/src/i18n/nl.tsv b/crates/ui-egui/src/i18n/nl.tsv
index b71526cc21..961a707a6e 100644
--- a/crates/ui-egui/src/i18n/nl.tsv
+++ b/crates/ui-egui/src/i18n/nl.tsv
@@ -4052,6 +4052,7 @@ curves	Smooth	Vloeiend maken
 	This document's layers: {needed} of {budget} for layers	Lagen van dit document: {needed} van {budget} voor lagen
 	This document's layers need {needed} but may hold {budget}: whole-document redraws use the CPU	De lagen van dit document hebben {needed} nodig maar mogen {budget} gebruiken: het hele document wordt op de CPU opnieuw getekend
 	GPU Memory (MB, 0 = Automatic)	GPU-geheugen (MB, 0 = Automatisch)
+	{path}: the path is not valid Unicode; save under another name.	{path}: het pad is geen geldige Unicode; sla op onder een andere naam.
 	{name} was changed by another app after it was opened or saved here.	{name} is door een andere app gewijzigd nadat het hier is geopend of bewaard.
 	Replace it with this document, or cancel and use File › Save As to keep both.	Vervang het door dit document, of annuleer en gebruik Bestand › Opslaan als om beide te houden.
 	Decrease Brush Size	Penseelgrootte verkleinen
@@ -4095,3 +4096,5 @@ curves	Smooth	Vloeiend maken
 	Pro Light Gray	Pro lichtgrijs
 	Pro Light	Pro licht
 	Resize Windows to Fit	Venstergrootte aanpassen
+
+	EXR	EXR
diff --git a/crates/ui-egui/src/i18n/pl.tsv b/crates/ui-egui/src/i18n/pl.tsv
index 90aa05e51f..6ecf85ef2b 100644
--- a/crates/ui-egui/src/i18n/pl.tsv
+++ b/crates/ui-egui/src/i18n/pl.tsv
@@ -3906,6 +3906,7 @@ curves	Smooth	Wygładź
 	This document's layers: {needed} of {budget} for layers	Warstwy tego dokumentu: {needed} z {budget} na warstwy
 	This document's layers need {needed} but may hold {budget}: whole-document redraws use the CPU	Warstwy tego dokumentu potrzebują {needed}, ale mogą zająć {budget}: odświeżanie całego dokumentu używa CPU
 	GPU Memory (MB, 0 = Automatic)	Pamięć GPU (MB, 0 = Automatycznie)
+	{path}: the path is not valid Unicode; save under another name.	{path}: ścieżka nie jest prawidłowym Unicode; zapisz pod inną nazwą.
 	Replace	Zastąp
 	{name} was changed by another app after it was opened or saved here.	Plik {name} został zmieniony przez inną aplikację po otwarciu lub zapisaniu go tutaj.
 	Replace it with this document, or cancel and use File › Save As to keep both.	Zastąp go tym dokumentem albo anuluj i użyj Plik › Zapisz jako, aby zachować oba.
@@ -3951,3 +3952,5 @@ curves	Smooth	Wygładź
 	Pro Light Gray	Pro (jasnoszary)
 	Pro Light	Pro (jasny)
 	Resize Windows to Fit	Dopasuj rozmiar okien
+
+	EXR	EXR
diff --git a/crates/ui-egui/src/i18n/pt-br.tsv b/crates/ui-egui/src/i18n/pt-br.tsv
index 7dcd2eed24..bf40b31e38 100644
--- a/crates/ui-egui/src/i18n/pt-br.tsv
+++ b/crates/ui-egui/src/i18n/pt-br.tsv
@@ -4082,6 +4082,7 @@ layerLabel	No Color	Sem cor
 	This document's layers: {needed} of {budget} for layers	Camadas deste documento: {needed} de {budget} para camadas
 	This document's layers need {needed} but may hold {budget}: whole-document redraws use the CPU	As camadas deste documento precisam de {needed} mas podem ocupar {budget}: o documento inteiro é redesenhado na CPU
 	GPU Memory (MB, 0 = Automatic)	Memória da GPU (MB, 0 = Automático)
+	{path}: the path is not valid Unicode; save under another name.	{path}: o caminho não é Unicode válido; salve com outro nome.
 	{name} was changed by another app after it was opened or saved here.	{name} foi alterado por outro app depois de ser aberto ou salvo aqui.
 	Replace it with this document, or cancel and use File › Save As to keep both.	Substitua-o por este documento, ou cancele e use Arquivo › Salvar como para manter os dois.
 	Decrease Brush Size	Diminuir tamanho do pincel
@@ -4274,3 +4275,5 @@ layerLabel	No Color	Sem cor
 	Pro Light Gray	Pro cinza claro
 	Pro Light	Pro claro
 	Resize Windows to Fit	Redimensionar janelas para caber
+
+	EXR	EXR
diff --git a/crates/ui-egui/src/i18n/ru.tsv b/crates/ui-egui/src/i18n/ru.tsv
index d8638248f7..9352cd240a 100644
--- a/crates/ui-egui/src/i18n/ru.tsv
+++ b/crates/ui-egui/src/i18n/ru.tsv
@@ -3268,6 +3268,7 @@ curves	Smooth	Сгладить
 	This document's layers: {needed} of {budget} for layers	Слои этого документа: {needed} из {budget} для слоёв
 	This document's layers need {needed} but may hold {budget}: whole-document redraws use the CPU	Слоям этого документа нужно {needed}, но занимать они могут {budget}: весь документ перерисовывается на CPU
 	GPU Memory (MB, 0 = Automatic)	Память GPU (МБ, 0 = автоматически)
+	{path}: the path is not valid Unicode; save under another name.	{path}: путь не является допустимым Unicode; сохраните под другим именем.
 	Replace	Заменить
 	{name} was changed by another app after it was opened or saved here.	Файл {name} был изменён другим приложением после того, как его открыли или сохранили здесь.
 	Replace it with this document, or cancel and use File › Save As to keep both.	Замените его этим документом или отмените и используйте Файл › Сохранить как, чтобы сохранить оба.
@@ -3314,3 +3315,5 @@ curves	Smooth	Сгладить
 	Pro Light Gray	Светло-серая Pro
 	Pro Light	Светлая Pro
 	Resize Windows to Fit	Подгонять размер окон
+
+	EXR	EXR
diff --git a/crates/ui-egui/src/i18n/sr.tsv b/crates/ui-egui/src/i18n/sr.tsv
index c1da31ad2b..c303d62954 100644
--- a/crates/ui-egui/src/i18n/sr.tsv
+++ b/crates/ui-egui/src/i18n/sr.tsv
@@ -4364,6 +4364,7 @@ shape	Appearance	Izgled
 	This document's layers: {needed} of {budget} for layers	Slojevi ovog dokumenta: {needed} od {budget} za slojeve
 	This document's layers need {needed} but may hold {budget}: whole-document redraws use the CPU	Slojevima ovog dokumenta treba {needed}, a smeju da zauzmu {budget}: ceo dokument se ponovo iscrtava na CPU-u
 	GPU Memory (MB, 0 = Automatic)	GPU memorija (MB, 0 = Automatski)
+	{path}: the path is not valid Unicode; save under another name.	{path}: putanja nije ispravan Unicode; sačuvajte pod drugim imenom.
 	{name} was changed by another app after it was opened or saved here.	Datoteku {name} je izmenila druga aplikacija nakon što je ovde otvorena ili sačuvana.
 	Replace it with this document, or cancel and use File › Save As to keep both.	Zameni je ovim dokumentom ili otkaži i koristi Datoteka › Sačuvaj kao da zadržiš obe.
 	Decrease Brush Size	Smanji veličinu četkice
@@ -4407,3 +4408,5 @@ shape	Appearance	Izgled
 	Pro Light Gray	Pro svetlosiva
 	Pro Light	Pro svetla
 	Resize Windows to Fit	Prilagodi veličinu prozora
+
+	EXR	EXR
diff --git a/crates/ui-egui/src/i18n/tr.tsv b/crates/ui-egui/src/i18n/tr.tsv
index 9571a5a500..7f34282232 100644
--- a/crates/ui-egui/src/i18n/tr.tsv
+++ b/crates/ui-egui/src/i18n/tr.tsv
@@ -4022,6 +4022,7 @@ cameraData	Lens	Lens
 	This document's layers: {needed} of {budget} for layers	Bu belgenin katmanları: katmanlar için {budget} içinden {needed}
 	This document's layers need {needed} but may hold {budget}: whole-document redraws use the CPU	Bu belgenin katmanlarının {needed} belleğe ihtiyacı var ama en fazla {budget} kullanabilirler: tüm belgenin yeniden çizimi CPU'yu kullanır
 	GPU Memory (MB, 0 = Automatic)	GPU Belleği (MB, 0 = Otomatik)
+	{path}: the path is not valid Unicode; save under another name.	{path}: yol geçerli bir Unicode değil; başka bir adla kaydedin.
 	{name} was changed by another app after it was opened or saved here.	{name}, burada açıldıktan veya kaydedildikten sonra başka bir uygulama tarafından değiştirildi.
 	Replace it with this document, or cancel and use File › Save As to keep both.	Bu belgeyle değiştirin ya da iptal edip ikisini de korumak için Dosya › Farklı Kaydet'i kullanın.
 	Decrease Brush Size	Fırça boyutunu küçült
@@ -4065,3 +4066,5 @@ cameraData	Lens	Lens
 	Pro Light Gray	Pro Açık Gri
 	Pro Light	Profesyonel Işık
 	Resize Windows to Fit	Pencereleri sığacak şekilde boyutlandır
+
+	EXR	EXR
diff --git a/crates/ui-egui/src/i18n/uk.tsv b/crates/ui-egui/src/i18n/uk.tsv
index 8121592015..734a4b394f 100644
--- a/crates/ui-egui/src/i18n/uk.tsv
+++ b/crates/ui-egui/src/i18n/uk.tsv
@@ -3991,6 +3991,7 @@ curves	Smooth	Згладити
 	This document's layers: {needed} of {budget} for layers	Шари цього документа: {needed} з {budget} для шарів
 	This document's layers need {needed} but may hold {budget}: whole-document redraws use the CPU	Шарам цього документа потрібно {needed}, але займати вони можуть {budget}: увесь документ перемальовується на CPU
 	GPU Memory (MB, 0 = Automatic)	Пам'ять GPU (МБ, 0 = автоматично)
+	{path}: the path is not valid Unicode; save under another name.	{path}: шлях не є коректним Unicode; збережіть під іншою назвою.
 	Replace	Замінити
 	{name} was changed by another app after it was opened or saved here.	Файл {name} змінила інша програма після того, як його тут відкрили або зберегли.
 	Replace it with this document, or cancel and use File › Save As to keep both.	Замініть його цим документом або скасуйте й скористайтеся Файл › Зберегти як, щоб зберегти обидва.
@@ -4044,3 +4045,5 @@ curves	Smooth	Згладити
 	Pro Light Gray	Світло-сіра «Профі»
 	Pro Light	Світла «Профі»
 	Resize Windows to Fit	Підганяти розмір вікон
+
+	EXR	EXR
diff --git a/crates/ui-egui/src/i18n/vi.tsv b/crates/ui-egui/src/i18n/vi.tsv
index b929ff14b2..eba481b276 100644
--- a/crates/ui-egui/src/i18n/vi.tsv
+++ b/crates/ui-egui/src/i18n/vi.tsv
@@ -3781,6 +3781,7 @@ curves	Smooth	Làm mượt
 	This document's layers: {needed} of {budget} for layers	Các lớp của tài liệu này: {needed} trên {budget} dành cho lớp
 	This document's layers need {needed} but may hold {budget}: whole-document redraws use the CPU	Các lớp của tài liệu này cần {needed} nhưng chỉ được dùng {budget}: vẽ lại toàn bộ tài liệu dùng CPU
 	GPU Memory (MB, 0 = Automatic)	Bộ nhớ GPU (MB, 0 = Tự động)
+	{path}: the path is not valid Unicode; save under another name.	{path}: đường dẫn không phải Unicode hợp lệ; hãy lưu với tên khác.
 	Replace	Thay thế
 	{name} was changed by another app after it was opened or saved here.	{name} đã bị một ứng dụng khác thay đổi sau khi được mở hoặc lưu ở đây.
 	Replace it with this document, or cancel and use File › Save As to keep both.	Thay thế bằng tài liệu này, hoặc hủy và dùng Tệp › Lưu thành để giữ cả hai.
@@ -3826,3 +3827,5 @@ curves	Smooth	Làm mượt
 	Pro Light Gray	Pro xám nhạt
 	Pro Light	Pro sáng
 	Resize Windows to Fit	Đổi cỡ cửa sổ cho vừa ảnh
+
+	EXR	EXR
diff --git a/crates/ui-egui/src/i18n/zh-hans.tsv b/crates/ui-egui/src/i18n/zh-hans.tsv
index 682fa62719..cf31e5c0b5 100644
--- a/crates/ui-egui/src/i18n/zh-hans.tsv
+++ b/crates/ui-egui/src/i18n/zh-hans.tsv
@@ -2941,6 +2941,7 @@ curves	Smooth	平滑
 	This document's layers: {needed} of {budget} for layers	此文档的图层：图层可用 {budget} 中的 {needed}
 	This document's layers need {needed} but may hold {budget}: whole-document redraws use the CPU	此文档的图层需要 {needed}，但只能占用 {budget}：整个文档的重绘使用 CPU
 	GPU Memory (MB, 0 = Automatic)	GPU 内存（MB，0 = 自动）
+	{path}: the path is not valid Unicode; save under another name.	{path}：路径不是有效的 Unicode；请以其他名称存储。
 	Replace	替换
 	{name} was changed by another app after it was opened or saved here.	{name} 在此处打开或存储后已被其他应用更改。
 	Replace it with this document, or cancel and use File › Save As to keep both.	用此文档替换它，或取消并使用“文件 › 另存为”以保留两者。
@@ -2987,3 +2988,5 @@ curves	Smooth	平滑
 	Pro Light Gray	专业浅灰
 	Pro Light	专业浅色
 	Resize Windows to Fit	调整窗口大小以适合
+
+	EXR	EXR
diff --git a/crates/ui-egui/src/i18n/zh-hant.tsv b/crates/ui-egui/src/i18n/zh-hant.tsv
index 66f79f6ed1..1bc730684b 100644
--- a/crates/ui-egui/src/i18n/zh-hant.tsv
+++ b/crates/ui-egui/src/i18n/zh-hant.tsv
@@ -2910,6 +2910,7 @@ curves	Smooth	平滑
 	This document's layers: {needed} of {budget} for layers	此文件的圖層：圖層可用 {budget} 中的 {needed}
 	This document's layers need {needed} but may hold {budget}: whole-document redraws use the CPU	此文件的圖層需要 {needed}，但只能佔用 {budget}：整份文件的重繪使用 CPU
 	GPU Memory (MB, 0 = Automatic)	GPU 記憶體（MB，0 = 自動）
+	{path}: the path is not valid Unicode; save under another name.	{path}：路徑不是有效的 Unicode；請以其他名稱儲存。
 	Replace	取代
 	{name} was changed by another app after it was opened or saved here.	{name} 在此處開啟或儲存後已被其他 App 更改。
 	Replace it with this document, or cancel and use File › Save As to keep both.	以此文件取代它，或取消並使用「檔案 › 另存新檔」以保留兩者。
@@ -2956,3 +2957,5 @@ curves	Smooth	平滑
 	Pro Light Gray	專業淺灰
 	Pro Light	專業淺色
 	Resize Windows to Fit	調整視窗大小以符合
+
+	EXR	EXR
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index 3f66a4f213..bdb1e6915f 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -1911,6 +1911,50 @@ impl PhotocraftApp {
         Ok(Some((path, warnings)))
     }
 
+    /// After `saver` was written to `path`, any other open document bound to that file no longer
+    /// matches it: it loses the file and is marked unsaved, so it can't stay "saved" while its file
+    /// holds something else, closing it asks first, and its own Save asks for a name instead of
+    /// writing over the new file (#6597). Paths are compared as files, so another letter case on a
+    /// case-insensitive volume or a hard link counts. A notice names the documents affected.
+    pub(crate) fn detach_others_from_file(&mut self, path: &str, saver: DocId) {
+        let others: Vec<(DocId, String)> = self
+            .session
+            .documents()
+            .iter()
+            .filter(|st| st.doc.id != saver && st.path.as_deref().is_some_and(|p| photocraft_engine::file_cmds::same_file(p, path)))
+            .map(|st| (st.doc.id, st.doc.name.clone()))
+            .collect();
+        let mut detached = Vec::new();
+        for (id, name) in others {
+            let done = self.with_document(id, |app| {
+                let st = app.session.active_mut().ok_or("no document")?;
+                st.path = None;
+                // No revision ever equals this, so the document reads as unsaved until saved again.
+                st.saved_revision = u64::MAX;
+                Ok(())
+            });
+            if done.is_ok() {
+                detached.push(name);
+            }
+        }
+        if detached.is_empty() {
+            return;
+        }
+        let name = file_open::display_name(path);
+        let title = {
+            let template = "{name} was saved over from another tab";
+            crate::i18n::fmt(tl!(template), &[("name", name.as_str())])
+        };
+        let lines = detached
+            .iter()
+            .map(|doc| {
+                let template = "\"{doc}\" no longer has a file and is marked unsaved: save it under a new name to keep it";
+                crate::i18n::fmt(tl!(template), &[("doc", doc.as_str())])
+            })
+            .collect();
+        notices::post(self, title, lines, false, None);
+    }
+
     /// Record a written save of document `doc` as it was at `revision`: its name, path and saved
     /// state (unless a copy), the status, script events and the warnings.
     pub(crate) fn saved(&mut self, doc: DocId, revision: u64, path: &str, warnings: &[String], copy: bool) {
@@ -1933,6 +1977,8 @@ impl PhotocraftApp {
             }
         };
         self.ui.status = crate::i18n::fmt(tl!("Saved {name}"), &[("name", path)]);
+        // The file was written, copy or not: another tab bound to it no longer matches it.
+        self.detach_others_from_file(path, doc);
         if !copy {
             // A background save may finish while another document is active (or after its
             // document was closed, when there is nothing left to record).
diff --git a/crates/ui-egui/src/menus.rs b/crates/ui-egui/src/menus.rs
index b7161ef74a..b9b4210fdb 100644
--- a/crates/ui-egui/src/menus.rs
+++ b/crates/ui-egui/src/menus.rs
@@ -1006,6 +1006,7 @@ pub fn menu_items(app: &PhotocraftApp) -> Vec<MenuItem> {
                 QuickExportFormat::Jpg => "JPG",
                 QuickExportFormat::Gif => "GIF",
                 QuickExportFormat::Webp => "WebP",
+                QuickExportFormat::Exr => "EXR",
             }
         };
         item.label = format!("Quick Export as {format}");
@@ -2177,7 +2178,7 @@ mod quick_export_label_tests {
     #[test]
     fn file_quick_export_menu_reflects_selected_format_without_renaming_layer_export() {
         let mut app = PhotocraftApp::new(photocraft_engine::Session::new(), crate::Services::default());
-        for (value, expected) in [("png", "PNG"), ("jpg", "JPG"), ("gif", "GIF"), ("webp", "WebP")] {
+        for (value, expected) in [("png", "PNG"), ("jpg", "JPG"), ("gif", "GIF"), ("webp", "WebP"), ("exr", "EXR")] {
             app.run("prefs.set", json!({"values": {"export.quickExportFormat": value}})).unwrap();
             let items = menu_items(&app);
             let quick: Vec<_> = items.iter().filter(|i| i.id == "file.export.quickExportAsPng").collect();
diff --git a/crates/ui-egui/src/prefs_ui.rs b/crates/ui-egui/src/prefs_ui.rs
index 96f1c130ea..ed6d3d8282 100644
--- a/crates/ui-egui/src/prefs_ui.rs
+++ b/crates/ui-egui/src/prefs_ui.rs
@@ -1255,6 +1255,7 @@ fn humanize(key: &str) -> String {
 
 fn choice_label(v: &str) -> String {
     match v {
+        "exr" => "EXR".into(),
         "cm" => "Centimeters".into(),
         "mm" => "Millimeters".into(),
         "75" | "80" | "85" | "90" | "95" | "100" | "125" | "150" | "175" | "200" | "250" | "300" => format!("{v}%"),
@@ -1512,6 +1513,7 @@ fn has_visible_fields(values: &Value, section: &str) -> bool {
 fn export_field_visible(obj: &Map<String, Value>, key: &str) -> bool {
     let format = obj.get("quickExportFormat").and_then(Value::as_str).unwrap_or("png");
     match key {
+        "convertToSrgb" | "metadata" => format != "exr",
         "jpegQuality" => format == "jpg",
         "webpLossless" => format == "webp",
         "webpQuality" => format == "webp" && obj.get("webpLossless").and_then(Value::as_bool) != Some(true),
@@ -2719,6 +2721,10 @@ mod tests {
         assert!(export_field_visible(&obj, "webpQuality"));
         assert_eq!(humanize("webpLossless"), "Lossless");
         assert_eq!(humanize("webpQuality"), "Quality");
+        obj.insert("quickExportFormat".into(), json!("exr"));
+        for key in ["jpegQuality", "webpLossless", "webpQuality", "convertToSrgb", "metadata"] {
+            assert!(!export_field_visible(&obj, key), "EXR must not offer ignored web settings: {key}");
+        }
     }
 
     #[test]
diff --git a/crates/ui-egui/src/shortcuts.rs b/crates/ui-egui/src/shortcuts.rs
index f0e0cc592d..e0ab91b601 100644
--- a/crates/ui-egui/src/shortcuts.rs
+++ b/crates/ui-egui/src/shortcuts.rs
@@ -602,6 +602,10 @@ pub fn handle(app: &mut PhotocraftApp, ctx: &egui::Context) {
     if crate::guide_select::keys(app, ctx) {
         return;
     }
+    // A slice selected with Slice Select: ⌫/Delete deletes the slice, not the layer (#7862).
+    if crate::slice_ui::keys(app, ctx) {
+        return;
+    }
     // Space+F (⇧Space+F backwards) cycles the pasteboard colour, as in Photoshop: F while the
     // Hand key is held, before F's own Cycle Screen Mode.
     if !matches!(focus, Focus::Text) && app.ui.text_edit.is_none() && crate::hold_keys::reposition_held(app, ctx) {
diff --git a/crates/ui-egui/src/slice_ui.rs b/crates/ui-egui/src/slice_ui.rs
index 32945c81b1..78e19f4be3 100644
--- a/crates/ui-egui/src/slice_ui.rs
+++ b/crates/ui-egui/src/slice_ui.rs
@@ -292,6 +292,39 @@ fn selected_id(app: &mut PhotocraftApp, promote: bool) -> Option<u32> {
     }
 }
 
+/// Delete or Backspace with no modifiers, with the Slice Select tool and a slice selected,
+/// deletes that slice, as in Photoshop (#7862). It never reaches Layer › Delete or Edit › Clear.
+/// An auto slice has nothing to delete, and View › Lock Slices refuses with a message.
+pub fn keys(app: &mut PhotocraftApp, ctx: &egui::Context) -> bool {
+    use crate::shortcut_dispatch::Focus;
+    // Text fields and widgets that delete with these keys themselves keep them.
+    if app.ui.tool != Tool::SliceSelect
+        || app.ui.slices.selected.is_none()
+        || app.ui.text_edit.is_some()
+        || matches!(Focus::of(ctx), Focus::Text | Focus::DeletingWidget)
+    {
+        return false;
+    }
+    let mods = ctx.input(|i| i.modifiers);
+    if !mods.is_none() || !ctx.input_mut(|i| i.consume_key(mods, egui::Key::Delete) || i.consume_key(mods, egui::Key::Backspace)) {
+        return false;
+    }
+    let result = if app.session.file_menu.slices_locked {
+        Err(tl!("Slices are locked (View › Lock Slices)").to_string())
+    } else {
+        match selected_id(app, false) {
+            Some(id) => app.run("slice.delete", json!({"slice": id})).map(|_| app.ui.slices.selected = None),
+            // An auto slice is made from the user slices around it: it goes when they do.
+            None => Ok(()),
+        }
+    };
+    if let Err(e) = result {
+        app.ui.status = e;
+        app.ui.status_error = true;
+    }
+    true
+}
+
 /// Slice Options dialog for the selected slice (auto slices are promoted on OK).
 pub fn open_options(app: &mut PhotocraftApp) -> Result<Value, String> {
     let n = app.ui.slices.selected.ok_or("select a slice with the Slice Select tool")?;
@@ -503,6 +536,60 @@ mod tests {
         assert_eq!(rect(&app), photocraft_geom::Rect::new(6, 11, 52, 46));
     }
 
+    /// Delete through the app's shortcut handling, as the canvas gets it.
+    fn press(app: &mut PhotocraftApp, key: egui::Key) {
+        let ctx = egui::Context::default();
+        let m = egui::Modifiers::NONE;
+        let raw = egui::RawInput {
+            events: vec![egui::Event::ModifiersChanged(m), egui::Event::Key { key, physical_key: None, pressed: true, repeat: false, modifiers: m }],
+            ..Default::default()
+        };
+        ctx.begin_pass(raw);
+        crate::shortcuts::handle(app, &ctx);
+        ctx.end_pass().textures_delta.clear();
+    }
+
+    /// #7862: with Slice Select, Delete (or Backspace) deletes the selected slice, never the
+    /// layer: in a one-layer document that used to fail with "a document must keep at least one
+    /// layer". Locked slices refuse; an auto slice has nothing to delete.
+    #[test]
+    fn delete_deletes_the_selected_slice_not_the_layer() {
+        let m = egui::Modifiers::NONE;
+        for key in [egui::Key::Delete, egui::Key::Backspace] {
+            let mut app = app();
+            let layers = app.session.active().unwrap().doc.layers.len();
+            app.ui.tool = Tool::Slice;
+            pointer(&mut app, ToolEvent::Down { x: 10.0, y: 10.0, pressure: 1.0 }, m);
+            pointer(&mut app, ToolEvent::Up { x: 40.0, y: 30.0 }, m);
+            app.ui.tool = Tool::SliceSelect;
+            pointer(&mut app, ToolEvent::Down { x: 20.0, y: 20.0, pressure: 1.0 }, m);
+            pointer(&mut app, ToolEvent::Up { x: 20.0, y: 20.0 }, m);
+            assert!(app.ui.slices.selected.is_some());
+
+            // Locked: the slice stays, and says why.
+            app.run("view.lockSlices", json!({"on": true})).unwrap();
+            press(&mut app, key);
+            assert_eq!(app.session.active().unwrap().doc.slices.list.len(), 1, "{key:?}: locked");
+            assert!(app.ui.status_error && app.ui.status.contains("locked"), "{key:?}: {}", app.ui.status);
+            app.run("view.lockSlices", json!({"on": false})).unwrap();
+            app.ui.status_error = false;
+
+            press(&mut app, key);
+            let doc = app.session.active().unwrap().doc.clone();
+            assert!(doc.slices.list.is_empty(), "{key:?}: the slice is deleted");
+            assert_eq!(doc.layers.len(), layers, "{key:?}: the layer stays");
+            assert!(!app.ui.status_error, "{key:?}: {}", app.ui.status);
+            assert_eq!(app.ui.slices.selected, None);
+
+            // An auto slice: nothing to delete, and still not the layer.
+            pointer(&mut app, ToolEvent::Down { x: 90.0, y: 75.0, pressure: 1.0 }, m);
+            pointer(&mut app, ToolEvent::Up { x: 90.0, y: 75.0 }, m);
+            press(&mut app, key);
+            assert_eq!(app.session.active().unwrap().doc.layers.len(), layers, "{key:?}: auto slice");
+            assert!(!app.ui.status_error, "{key:?}: {}", app.ui.status);
+        }
+    }
+
     #[test]
     fn locked_slices_ignore_gestures() {
         let mut app = app();
diff --git a/crates/ui-egui/src/view_cmds.rs b/crates/ui-egui/src/view_cmds.rs
index 77f8d78248..26208d2a43 100644
--- a/crates/ui-egui/src/view_cmds.rs
+++ b/crates/ui-egui/src/view_cmds.rs
@@ -1525,6 +1525,7 @@ pub(crate) fn write_copy(app: &mut PhotocraftApp, doc: &photocraft_doc::Document
     let (bytes, warnings) = export(doc, path, &settings)?;
     let write = app.services.write.as_mut().ok_or("no writer configured")?;
     write(path, &bytes)?;
+    app.detach_others_from_file(path, doc.id);
     let template = "Saved a copy as {path}";
     app.ui.status = crate::i18n::fmt(tl!(template), &[("path", path)]);
     app.ui.status_error = false;