diff --git a/Cargo.lock b/Cargo.lock
index c60cedafd3..5d3156368d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4339,6 +4339,7 @@ name = "photocraft-engine"
 version = "0.6.0"
 dependencies = [
  "blake3",
+ "exr",
  "flate2",
  "photocraft-affinity",
  "photocraft-algo",
diff --git a/crates/codecs/src/codecs/exr.rs b/crates/codecs/src/codecs/exr.rs
index 57197ee7a9..a4014db0b3 100644
--- a/crates/codecs/src/codecs/exr.rs
+++ b/crates/codecs/src/codecs/exr.rs
@@ -181,6 +181,77 @@ pub(crate) fn decode_part(bytes: &[u8], index: usize, limits: &Limits) -> Result
     layer_to_image(&read_layer(bytes, index)?)
 }
 
+/// Decodes the named channels of one flat part (exact names as the file stores them, e.g.
+/// `diffuse.R`) into an image: R/G/B (plus A when named) give Rgba, a lone Y gives Gray. This
+/// is how a channel group renders without the part's other channels in the way.
+pub(crate) fn decode_channels(bytes: &[u8], index: usize, names: &[&str], limits: &Limits) -> Result<Image, CodecError> {
+    let meta = read_meta(bytes, limits)?;
+    if meta.requirements.has_deep_data {
+        return Err(CodecError::unsupported(F, "this file has deep parts; the deep decoder composites those (mixing flat and deep parts is not supported)"));
+    }
+    if index >= meta.headers.len() {
+        return Err(err(format!("part index {index} is out of range ({} parts)", meta.headers.len())));
+    }
+    let layer = read_layer(bytes, index)?;
+    let (w, h) = (layer.size.0, layer.size.1);
+    let channels = &layer.channel_data.list;
+    let npx = w * h;
+    let mut picked: Vec<&AnyChannel<FlatSamples>> = Vec::with_capacity(names.len());
+    for name in names {
+        let c = channels.iter().find(|c| c.name.to_string() == *name).ok_or_else(|| err(format!("the part has no channel {name}")))?;
+        if c.sample_data.len() != npx {
+            return Err(err("channel sample count mismatch (subsampled channels are unsupported)"));
+        }
+        picked.push(c);
+    }
+    let base = |c: &AnyChannel<FlatSamples>| -> String { base_channel_name(&c.name.to_string()).to_string() };
+    let has = |n: &str| picked.iter().any(|c| base(c) == n);
+    let (layout, order): (ChannelLayout, Vec<Option<usize>>) = if has("R") && has("G") && has("B") {
+        let at = |n: &str| picked.iter().position(|c| base(c) == n);
+        match has("A").then(|| at("A")) {
+            Some(a) => (ChannelLayout::Rgba, vec![at("R"), at("G"), at("B"), a]),
+            None => (ChannelLayout::Rgb, vec![at("R"), at("G"), at("B"), None]),
+        }
+    } else if has("Y") {
+        let y = picked.iter().position(|c| base(c) == "Y");
+        match picked.iter().position(|c| base(c) == "A") {
+            Some(a) => (ChannelLayout::GrayA, vec![y, Some(a)]),
+            None => (ChannelLayout::Gray, vec![y]),
+        }
+    } else if picked.len() == 1 {
+        (ChannelLayout::Gray, vec![Some(0)])
+    } else {
+        return Err(CodecError::unsupported(F, "the named channels are no R/G/B or Y set"));
+    };
+    let all_f16 = picked.iter().all(|c| matches!(c.sample_data, FlatSamples::F16(_)));
+    let nc = layout.channels();
+    let (w32, h32) = (w as u32, h as u32);
+    // The None slots sit past the layout's own channels (the absent A of an RGB pick) and
+    // are skipped, so the buffer keeps its pixel stride.
+    let img = if all_f16 {
+        let mut out = vec![f16::ZERO; npx * nc];
+        for (ci, pick) in order.iter().enumerate() {
+            let Some(idx) = pick else { continue };
+            let Some(FlatSamples::F16(v)) = picked.get(*idx).map(|c| &c.sample_data) else { continue };
+            for (i, s) in v.iter().enumerate() {
+                out[i * nc + ci] = *s;
+            }
+        }
+        Image::from_f16(w32, h32, layout, &out)
+    } else {
+        let mut out = vec![0f32; npx * nc];
+        for (ci, pick) in order.iter().enumerate() {
+            let Some(idx) = pick else { continue };
+            let Some(c) = picked.get(*idx) else { continue };
+            for (i, s) in c.sample_data.values_as_f32().enumerate() {
+                out[i * nc + ci] = s;
+            }
+        }
+        Image::from_f32(w32, h32, layout, &out)
+    };
+    img.map_err(|e| CodecError::encode(F, e))
+}
+
 pub(crate) fn encode(src: &Image, plan: Plan, opts: &EncodeOptions) -> Result<Vec<u8>, CodecError> {
     let img = src.converted(plan.layout, plan.sample);
     let (w, h) = (img.width() as usize, img.height() as usize);
diff --git a/crates/codecs/src/lib.rs b/crates/codecs/src/lib.rs
index 4ad8a0ef3e..cc8d0558b2 100644
--- a/crates/codecs/src/lib.rs
+++ b/crates/codecs/src/lib.rs
@@ -163,6 +163,14 @@ pub fn decode_cryptomatte(bytes: &[u8], layer_name: &str, limits: &Limits) -> Re
     codecs::exr_cryptomatte::decode(bytes, layer_name, limits)
 }
 
+/// Decodes the named channels of one part (exact names as the file stores them, e.g.
+/// `diffuse.R`) into an image: R/G/B (plus A when named) give Rgba, a lone Y gives Gray.
+/// This renders a channel group without the part's other channels in the way.
+pub fn decode_exr_channels(bytes: &[u8], part: usize, names: &[&str], opts: &DecodeOptions) -> Result<Image, CodecError> {
+    let img = exr::decode_channels(bytes, part, names, &opts.limits)?;
+    finish_decode(img, 1, opts)
+}
+
 /// Deep OpenEXR samples (`deepscanline`/`deeptile`): the structured per-pixel sample lists
 /// (colour, alpha and Z per sample), for callers that composite deep data themselves —
 /// [`decode_as_with`] instead flattens a deep file into a normal [`Image`] with a
diff --git a/crates/engine/Cargo.toml b/crates/engine/Cargo.toml
index 97b8a1f4cd..fa15c30986 100644
--- a/crates/engine/Cargo.toml
+++ b/crates/engine/Cargo.toml
@@ -44,3 +44,5 @@ photocraft-affinity = { workspace = true, features = ["synth"] }
 photocraft-raw = { workspace = true, features = ["testgen"] }
 # WebAssembly text -> binary for plug-in test modules (Apache-2.0 WITH LLVM-exception).
 wat = "1.228"
+# Synthetic multi-part EXR fixtures for the parts-commands tests.
+exr = { version = "1.73", default-features = false }
diff --git a/crates/engine/src/commands.rs b/crates/engine/src/commands.rs
index fad98f923e..848cdffd3b 100644
--- a/crates/engine/src/commands.rs
+++ b/crates/engine/src/commands.rs
@@ -1143,6 +1143,7 @@ fn build() -> Vec<CommandSpec> {
     v.extend(crate::paint_cmds::specs());
     v.extend(crate::extra_cmds::specs());
     v.extend(crate::file_cmds::specs());
+    v.extend(crate::exr_cmds::specs());
     v.extend(crate::type_extra_cmds::specs());
     v.extend(crate::type_styles_cmds::specs());
     v.extend(crate::type_spell_cmds::specs());
diff --git a/crates/engine/src/exr_cmds.rs b/crates/engine/src/exr_cmds.rs
new file mode 100644
index 0000000000..c0a3310f9f
--- /dev/null
+++ b/crates/engine/src/exr_cmds.rs
@@ -0,0 +1,265 @@
+//! EXR parts: what a multi-part or channel-grouped EXR file holds, and opening the chosen
+//! parts/groups as the layers of one document (a Maya/Arnold render writes one part per
+//! AOV). The query command feeds the File › Open EXR Parts… dialog, the CLI, MCP and the
+//! control channel alike.
+
+use serde_json::{Value, json};
+
+use crate::commands::CommandSpec;
+use crate::file_cmds::{native, read_file, stem};
+use crate::{EngineError, Result, Session};
+
+fn entries_json(path: &str) -> Result<Value> {
+    let bytes = read_file(path)?;
+    let entries = photocraft_io::exr_parts::entries(&bytes).map_err(|e| EngineError::Other(format!("{path}: {e}")))?;
+    Ok(json!(entries
+        .iter()
+        .map(|e| json!({
+            "kind": match e.kind { photocraft_io::exr_parts::EntryKind::Part => "part", photocraft_io::exr_parts::EntryKind::Group => "group", photocraft_io::exr_parts::EntryKind::Cryptomatte => "cryptomatte" },
+            "name": e.name,
+            "view": e.view,
+            "width": e.width,
+            "height": e.height,
+            "channels": e.channels,
+            "objects": e.objects,
+        }))
+        .collect::<Vec<_>>()))
+}
+
+fn exr_parts(s: &mut Session, p: &Value) -> Result<Value> {
+    let _ = s;
+    let path = crate::file_cmds::str_param(p, "path", "file.exrParts")?.to_string();
+    entries_json(&path)
+}
+
+/// Collects `part/<name>` and `group/<name>` boolean params into the selection names.
+fn selected(p: &Value, prefix: &str) -> Vec<String> {
+    p.as_object()
+        .map(|m| m.iter().filter(|(k, v)| k.starts_with(prefix) && v.as_bool() == Some(true)).map(|(k, _)| k[prefix.len()..].to_string()).collect())
+        .unwrap_or_default()
+}
+
+fn open_exr_parts(s: &mut Session, p: &Value) -> Result<Value> {
+    let path = crate::file_cmds::str_param(p, "path", "file.openExrParts")?.to_string();
+    let view = p.get("view").and_then(Value::as_str).unwrap_or("both");
+    if !matches!(view, "both" | "left" | "right") {
+        return Err(EngineError::BadParams { cmd: "file.openExrParts".into(), msg: format!("view is \"{view}\"; it is \"both\", \"left\" or \"right\"") });
+    }
+    let sel = photocraft_io::exr_parts::Selection {
+        parts: selected(p, "part/"),
+        groups: selected(p, "group/"),
+        view: view.to_string(),
+        precomp: p.get("precomp").and_then(Value::as_bool).unwrap_or(false),
+    };
+    let bytes = read_file(&path)?;
+    let r = photocraft_io::exr_parts::import(&stem(&path), &bytes, &sel).map_err(|e| EngineError::Other(format!("{path}: {e}")))?;
+    let (i, color) = s.open_document(r.document, Some(path.clone()));
+    Ok(json!({"document": i, "color": color, "warnings": r.warnings}))
+}
+
+pub fn specs() -> Vec<CommandSpec> {
+    macro_rules! spec {
+        ($id:expr, $label:expr, $menu:expr, $sc:expr, $params:expr, $enabled:expr, $run:expr) => {
+            CommandSpec { id: $id, label: $label, menu: $menu, shortcut: $sc, params: $params, enabled: $enabled, journal: true, run: $run }
+        };
+    }
+    vec![
+        spec!("file.exrParts", "EXR Parts Info", &[], None, r##"{"path":str (the EXR file)}"##, native, exr_parts),
+        spec!(
+            "file.openExrParts",
+            "Open EXR Parts…",
+            &["File"],
+            None,
+            r##"{"path":str (the EXR file),"view":"both|left|right"="both","part/<name>":bool (import this part as a layer),"group/<name>":bool (import this channel group as a layer),"precomp":bool=false (add the additive beauty precomp from the AOVs)}"##,
+            native,
+            open_exr_parts
+        ),
+    ]
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use photocraft_doc::ColorMode;
+
+    fn session() -> Session {
+        Session::new()
+    }
+
+    // The fixture writer mirrors the codecs tests: a small multi-part EXR via the `exr`
+    // crate, one part per AOV plus a single-part file with prefixed channel groups.
+
+    fn write_multipart(path: &std::path::Path) {
+        use exr::prelude::*;
+        let (w, h) = (4usize, 4usize);
+        let mk = |n: String, v: f32| AnyChannel::new(n.as_str(), FlatSamples::F32(vec![v; w * h]));
+        let beauty = AnyChannels::sort(vec![mk("R".into(), 0.8), mk("G".into(), 0.4), mk("B".into(), 0.2), mk("A".into(), 1.0)].into_iter().collect());
+        let z = AnyChannels::sort(vec![mk("Z".into(), 5.0)].into_iter().collect());
+        let layer = |name: &str, chans: AnyChannels<FlatSamples>| {
+            Layer::new(
+                (w, h),
+                LayerAttributes::named(name),
+                Encoding { compression: Compression::Uncompressed, blocks: Blocks::ScanLines, line_order: LineOrder::Increasing },
+                chans,
+            )
+        };
+        let image = Image::from_layers(ImageAttributes::new(IntegerBounds::new((0, 0), (w, h))), vec![layer("Z", z), layer("beauty", beauty)]);
+        image.write().to_buffered(&mut std::io::BufWriter::new(std::fs::File::create(path).expect("create fixture"))).expect("write fixture");
+    }
+
+    fn write_grouped(path: &std::path::Path) {
+        use exr::prelude::*;
+        let (w, h) = (4usize, 4usize);
+        let mk = |n: String, v: f32| AnyChannel::new(n.as_str(), FlatSamples::F32(vec![v; w * h]));
+        // Two AOV groups (each with alpha) plus the beauty RGBA, in ONE part.
+        let list = vec![
+            mk("diffuse.R".into(), 0.3),
+            mk("diffuse.G".into(), 0.3),
+            mk("diffuse.B".into(), 0.3),
+            mk("diffuse.A".into(), 0.5),
+            mk("specular.R".into(), 0.6),
+            mk("specular.G".into(), 0.6),
+            mk("specular.B".into(), 0.6),
+            mk("specular.A".into(), 0.25),
+            mk("R".into(), 0.9),
+            mk("G".into(), 0.9),
+            mk("B".into(), 0.9),
+            mk("A".into(), 1.0),
+        ];
+        let layer = Layer::new(
+            (w, h),
+            LayerAttributes::named("main"),
+            Encoding { compression: Compression::Uncompressed, blocks: Blocks::ScanLines, line_order: LineOrder::Increasing },
+            AnyChannels::sort(list.into_iter().collect()),
+        );
+        let image = Image::from_layers(ImageAttributes::new(IntegerBounds::new((0, 0), (w, h))), vec![layer]);
+        image.write().to_buffered(&mut std::io::BufWriter::new(std::fs::File::create(path).expect("create fixture"))).expect("write fixture");
+    }
+
+    #[test]
+    fn exr_parts_lists_parts_groups_and_views() {
+        let dir = std::env::temp_dir().join(format!("pcraft-exr-parts-{}", std::process::id()));
+        std::fs::create_dir_all(&dir).unwrap();
+        let path = dir.join("aov.exr");
+        write_multipart(&path);
+        let info = entries_json(path.to_str().unwrap()).unwrap();
+        let kinds: Vec<&str> = info.as_array().unwrap().iter().map(|e| e["kind"].as_str().unwrap()).collect();
+        assert_eq!(kinds, ["part", "part"], "{info}");
+        assert_eq!(info[0]["name"], "Z");
+        assert_eq!(info[1]["name"], "beauty");
+        assert_eq!(info[1]["channels"], 4);
+        std::fs::remove_dir_all(&dir).unwrap();
+    }
+
+    #[test]
+    fn open_exr_parts_imports_the_chosen_part_as_a_layer() {
+        let dir = std::env::temp_dir().join(format!("pcraft-exr-open-{}", std::process::id()));
+        std::fs::create_dir_all(&dir).unwrap();
+        let path = dir.join("aov.exr");
+        write_multipart(&path);
+        let mut s = session();
+        let r = s.execute("file.openExrParts", json!({"path": path.to_str().unwrap(), "part/beauty": true, "part/Z": false})).unwrap();
+        assert_eq!(r["warnings"].as_array().unwrap().len(), 0, "{r}");
+        let doc = &s.active().unwrap().doc;
+        assert_eq!(doc.layers.len(), 1);
+        assert_eq!(doc.layers[0].name, "beauty");
+        // The beauty pixels survived (R 0.8 at pixel 0).
+        if let photocraft_doc::LayerContent::Raster(surface) = &doc.layers[0].content {
+            let px = surface.pixel(0, 0);
+            assert!((px[0] - 0.8).abs() < 1e-4, "{:?}", px);
+        } else {
+            panic!("expected a raster layer");
+        }
+        std::fs::remove_dir_all(&dir).unwrap();
+    }
+
+    #[test]
+    fn open_exr_parts_refuses_an_empty_selection_and_unknown_names() {
+        let dir = std::env::temp_dir().join(format!("pcraft-exr-empty-{}", std::process::id()));
+        std::fs::create_dir_all(&dir).unwrap();
+        let path = dir.join("aov.exr");
+        write_multipart(&path);
+        let mut s = session();
+        let e = s.execute("file.openExrParts", json!({"path": path.to_str().unwrap()})).unwrap_err();
+        assert!(e.to_string().contains("no parts or groups selected"), "{e}");
+        let e = s.execute("file.openExrParts", json!({"path": path.to_str().unwrap(), "part/nope": true})).unwrap_err();
+        assert!(e.to_string().contains("no flat part named nope"), "{e}");
+        std::fs::remove_dir_all(&dir).unwrap();
+    }
+
+    #[test]
+    fn channel_groups_import_from_their_own_channels() {
+        let dir = std::env::temp_dir().join(format!("pcraft-exr-groups-{}", std::process::id()));
+        std::fs::create_dir_all(&dir).unwrap();
+        let path = dir.join("grouped.exr");
+        write_grouped(&path);
+        let info = entries_json(path.to_str().unwrap()).unwrap();
+        let names: Vec<&str> = info.as_array().unwrap().iter().map(|e| e["name"].as_str().unwrap()).collect();
+        assert_eq!(names, ["main", "diffuse", "specular"], "{info}");
+        let mut s = session();
+        s.execute("file.openExrParts", json!({"path": path.to_str().unwrap(), "group/diffuse": true})).unwrap();
+        let doc = &s.active().unwrap().doc;
+        assert_eq!(doc.layers.len(), 1);
+        assert_eq!(doc.layers[0].name, "diffuse");
+        if let photocraft_doc::LayerContent::Raster(surface) = &doc.layers[0].content {
+            let px = surface.pixel(0, 0);
+            // The channels import as stored (straight here): values are untouched.
+            assert!((px[0] - 0.3).abs() < 1e-4, "{:?}", px);
+            assert!((px[3] - 0.5).abs() < 1e-4, "{:?}", px);
+        }
+        std::fs::remove_dir_all(&dir).unwrap();
+    }
+
+    #[test]
+    fn precomp_sums_the_light_path_set_and_refuses_an_incomplete_one() {
+        let dir = std::env::temp_dir().join(format!("pcraft-exr-precomp-{}", std::process::id()));
+        std::fs::create_dir_all(&dir).unwrap();
+        let path = dir.join("grouped.exr");
+        write_grouped(&path);
+        let mut s = session();
+        // diffuse + specular make the set incomplete: emission is missing.
+        let e = s.execute("file.openExrParts", json!({"path": path.to_str().unwrap(), "precomp": true, "group/diffuse": true})).unwrap_err();
+        assert!(e.to_string().contains("missing") && e.to_string().contains("emission"), "{e}");
+
+        // A complete set: write a file holding direct/indirect diffuse+specular and emission.
+        let full = dir.join("full.exr");
+        use exr::prelude::*;
+        let (w, h) = (4usize, 4usize);
+        let mk = |n: String, v: f32| AnyChannel::new(n.as_str(), FlatSamples::F32(vec![v; w * h]));
+        let aovs = [
+            ("direct_diffuse", 0.10, 1.0),
+            ("indirect_diffuse", 0.20, 1.0),
+            ("direct_specular", 0.05, 1.0),
+            ("indirect_specular", 0.15, 1.0),
+            ("emission", 0.30, 1.0),
+        ];
+        let mut list: Vec<AnyChannel<FlatSamples>> = Vec::new();
+        let mut expect = 0.0f32;
+        for (name, v, a) in aovs {
+            list.push(mk(format!("{name}.R"), v));
+            list.push(mk(format!("{name}.G"), v));
+            list.push(mk(format!("{name}.B"), v));
+            list.push(mk(format!("{name}.A"), a));
+            expect += v * a;
+        }
+        let layer = Layer::new(
+            (w, h),
+            LayerAttributes::named("main"),
+            Encoding { compression: Compression::Uncompressed, blocks: Blocks::ScanLines, line_order: LineOrder::Increasing },
+            AnyChannels::sort(list.into_iter().collect()),
+        );
+        let image = Image::from_layers(ImageAttributes::new(IntegerBounds::new((0, 0), (w, h))), vec![layer]);
+        image.write().to_buffered(&mut std::io::BufWriter::new(std::fs::File::create(&full).expect("create fixture"))).expect("write fixture");
+        let mut s = session();
+        let r = s.execute("file.openExrParts", json!({"path": full.to_str().unwrap(), "precomp": true})).unwrap();
+        assert!(r["warnings"].as_array().unwrap().iter().any(|w| w.as_str().unwrap().contains("precomp")), "{r}");
+        let doc = &s.active().unwrap().doc;
+        let precomp = doc.layers.iter().find(|l| l.name == "beauty (precomp)").expect("the precomp layer");
+        if let photocraft_doc::LayerContent::Raster(surface) = &precomp.content {
+            let px = surface.pixel(0, 0);
+            assert!((px[0] - expect).abs() < 1e-3, "{:?} vs {expect}", px);
+        }
+        assert_eq!(doc.mode, ColorMode::Rgb);
+        std::fs::remove_dir_all(&dir).unwrap();
+    }
+}
diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index df55281a4f..5245eed1c4 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -32,6 +32,7 @@ pub mod document_preset_cmds;
 pub mod edit_cmds;
 pub mod edit_menu_cmds;
 pub mod eraser_cmds;
+pub mod exr_cmds;
 pub mod extra_cmds;
 pub mod file_cmds;
 pub mod fill_cmds;
diff --git a/crates/io/src/exr_parts.rs b/crates/io/src/exr_parts.rs
new file mode 100644
index 0000000000..93b8e85f36
--- /dev/null
+++ b/crates/io/src/exr_parts.rs
@@ -0,0 +1,335 @@
+//! Multi-part EXR and channel groups as layers (a Maya/Arnold render writes one part per
+//! AOV, or a single part with prefixed channel sets like `diffuse.R`): the entries of a
+//! file listed for a chooser ([`entries`]), and the chosen ones imported as the layers of
+//! one document ([`import`]), with an optional additive beauty precomp from the AOVs.
+
+use photocraft_cms::Builtin;
+use photocraft_codecs::{self as codecs, ChannelLayout, DecodeOptions, Image, SampleType};
+use photocraft_color::{ColorMode, SampleType as DocSample};
+use photocraft_doc::{Document, Layer, LayerContent, Size};
+use photocraft_raster::Surface;
+
+use crate::{ImportResult, IoError, flat::image_surface};
+
+/// One selectable line of the chooser: a whole part, a prefixed channel group inside a
+/// part, or a Cryptomatte layer (listed for information; its samples are not image layers).
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct Entry {
+    pub kind: EntryKind,
+    /// The name as shown and selected: the part name, the channel-group prefix, or the
+    /// Cryptomatte layer name.
+    pub name: String,
+    /// The part's `view` attribute (stereo files), when it has one.
+    pub view: Option<String>,
+    pub width: u32,
+    pub height: u32,
+    /// Image channels that would import (4 for RGBA, 3 for RGB); Cryptomatte: stream count.
+    pub channels: usize,
+    /// Cryptomatte only: objects in the parsed manifest.
+    pub objects: Option<usize>,
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum EntryKind {
+    Part,
+    Group,
+    Cryptomatte,
+}
+
+/// One channel group: where it lives and which exact channels make up its RGB(A).
+#[derive(Clone, Debug)]
+struct Group {
+    /// The prefix before the last dot (`diffuse` of `diffuse.R`).
+    prefix: String,
+    part: usize,
+    channels: Vec<String>,
+    alpha: Option<String>,
+}
+
+/// The name an AOV normalizes to for the precomp check (`Direct_Diffuse` and
+/// `directDiffuse` are the same AOV).
+fn normalize(name: &str) -> String {
+    name.chars().filter(|c| c.is_ascii_alphanumeric()).collect::<String>().to_ascii_lowercase()
+}
+
+/// The additive AOVs a beauty precomp is built from: the light-path set Arnold writes.
+const PRECOMP_REQUIRED: [&str; 5] = ["directdiffuse", "indirectdiffuse", "directspecular", "indirectspecular", "emission"];
+const PRECOMP_OPTIONAL: [&str; 3] = ["transmission", "sss", "volume"];
+
+/// The base channel name (`R` of `diffuse.R`, `R` of `R`).
+fn channel_base(name: &str) -> &str {
+    name.rsplit('.').next().unwrap_or(name)
+}
+
+/// The prefixed RGB(A) channel sets of every flat part (`diffuse.R/G/B` make the group
+/// `diffuse`). Unprefixed channels are no group, and a prefix ending in digits is a
+/// Cryptomatte stream (`crypto_asset00`), not a group. Each prefix is listed once.
+fn groups(bytes: &[u8]) -> Result<Vec<Group>, IoError> {
+    let mut out: Vec<Group> = Vec::new();
+    for part in codecs::exr_info(bytes, &Default::default())? {
+        if part.deep {
+            continue;
+        }
+        let mut found: Vec<Group> = Vec::new();
+        for c in &part.channels {
+            let Some((prefix, base)) = channel_base_split(&c.name) else { continue };
+            if prefix.chars().last().is_some_and(|ch| ch.is_ascii_digit()) {
+                continue;
+            }
+            if found.iter_mut().all(|g| g.prefix != prefix) {
+                found.push(Group { prefix: prefix.to_string(), part: part.index, channels: Vec::new(), alpha: None });
+            }
+            let Some(group) = found.iter_mut().find(|g| g.prefix == prefix) else { continue };
+            match base {
+                "R" | "G" | "B" => group.channels.push(c.name.clone()),
+                "A" => group.alpha = Some(c.name.clone()),
+                _ => {}
+            }
+        }
+        found.retain(|g| g.channels.len() == 3);
+        out.extend(found);
+    }
+    Ok(out)
+}
+
+/// `(prefix, base)` when the channel name carries a dot (`diffuse.R`); `None` unprefixed.
+fn channel_base_split(name: &str) -> Option<(&str, &str)> {
+    let (prefix, base) = name.rsplit_once('.')?;
+    (!prefix.is_empty()).then_some((prefix, base))
+}
+
+/// Lists the entries of a multi-part or channel-grouped EXR for a chooser: flat parts in
+/// file order, then the channel groups, then the Cryptomatte layers as information. A file
+/// whose parts are all deep is refused (the deep decoder composites those).
+pub fn entries(bytes: &[u8]) -> Result<Vec<Entry>, IoError> {
+    let info = codecs::exr_info(bytes, &Default::default())?;
+    if info.iter().all(|p| p.deep) {
+        return Err(IoError::Unsupported("this EXR holds only deep parts; it opens through the deep decoder".into()));
+    }
+    let mut out = Vec::new();
+    for part in &info {
+        if part.deep {
+            continue;
+        }
+        out.push(Entry {
+            kind: EntryKind::Part,
+            name: part.name.clone().unwrap_or_else(|| format!("part {}", part.index)),
+            view: part.view.clone(),
+            width: part.width,
+            height: part.height,
+            channels: part.channels.iter().filter(|c| ["R", "G", "B", "A", "Y"].contains(&channel_base(&c.name))).count(),
+            objects: None,
+        });
+    }
+    for group in groups(bytes)? {
+        out.push(Entry {
+            kind: EntryKind::Group,
+            name: group.prefix.clone(),
+            view: None,
+            width: 0,
+            height: 0,
+            channels: 3 + usize::from(group.alpha.is_some()),
+            objects: None,
+        });
+    }
+    for layer in codecs::cryptomatte_layers(bytes, &Default::default())? {
+        out.push(Entry {
+            kind: EntryKind::Cryptomatte,
+            name: layer.name.clone(),
+            view: None,
+            width: 0,
+            height: 0,
+            channels: layer.channels.len(),
+            objects: Some(layer.manifest.len()),
+        });
+    }
+    Ok(out)
+}
+
+/// What [`import`] turns into layers.
+pub struct Selection {
+    /// Part names to import as whole layers.
+    pub parts: Vec<String>,
+    /// Channel-group prefixes to import as layers.
+    pub groups: Vec<String>,
+    /// `"both"`, `"left"` or `"right"`: which stereo views of the parts to consider.
+    pub view: String,
+    /// Add a `beauty (precomp)` layer summed from the file's AOV groups (see
+    /// [`PRECOMP_REQUIRED`]); fails naming the missing AOVs when the set is incomplete.
+    pub precomp: bool,
+}
+
+/// An image as an importable layer: F16 becomes F32 (lossless, warned once by the caller),
+/// the layout matches the document's, the surface is built a band of rows at a time. The
+/// returned mode tells the caller whether this layer is grayscale.
+fn layer_surface(img: &Image, max: &mut (u32, u32)) -> Result<(Surface, ColorMode), IoError> {
+    let (layout, mode) = if matches!(img.layout(), ChannelLayout::Gray | ChannelLayout::GrayA) {
+        (ChannelLayout::GrayA, ColorMode::Grayscale)
+    } else {
+        (ChannelLayout::Rgba, ColorMode::Rgb)
+    };
+    max.0 = max.0.max(img.width());
+    max.1 = max.1.max(img.height());
+    let converted = img.convert(layout, SampleType::F32);
+    image_surface(&converted, layout, SampleType::F32).map(|s| (s, mode))
+}
+
+/// Imports the chosen entries as the layers of one document: parts whole, groups from their
+/// own channels, F16 kept losslessly as F32, the linear-light EXR values tagged linear sRGB.
+/// `precomp` adds the additive sum of the file's AOV groups as a top layer and fails,
+/// naming the missing AOVs, when the light-path set is incomplete.
+pub fn import(name: &str, bytes: &[u8], sel: &Selection) -> Result<ImportResult, IoError> {
+    let opts = DecodeOptions::default();
+    let info = codecs::exr_info(bytes, &opts.limits)?;
+    if info.is_empty() {
+        return Err(IoError::Unsupported("the EXR has no parts".into()));
+    }
+    let all_groups = groups(bytes)?;
+    let view_passes = |view: &Option<String>| view.as_ref().is_none_or(|v| sel.view.eq_ignore_ascii_case("both") || v.eq_ignore_ascii_case(&sel.view));
+    let part_by_name =
+        |want: &str| info.iter().find(|p| !p.deep && p.name.as_deref() == Some(want)).ok_or_else(|| IoError::Unsupported(format!("no flat part named {want}")));
+    let mut chosen_parts: Vec<&codecs::ExrPartInfo> = Vec::new();
+    for want in &sel.parts {
+        let p = part_by_name(want)?;
+        if !view_passes(&p.view) {
+            return Err(IoError::Unsupported(format!("the part {want} is of the {:?} view, the filter is {}", p.view, sel.view)));
+        }
+        if !chosen_parts.iter().any(|c| c.index == p.index) {
+            chosen_parts.push(p);
+        }
+    }
+    let mut chosen_groups: Vec<&Group> = Vec::new();
+    for want in &sel.groups {
+        let g = all_groups.iter().find(|g| g.prefix == *want).ok_or_else(|| IoError::Unsupported(format!("no channel group named {want}")))?;
+        let part_view = info.get(g.part).and_then(|p| p.view.clone());
+        if !view_passes(&part_view) {
+            return Err(IoError::Unsupported(format!("the group {} is of the {:?} view, the filter is {}", want, part_view, sel.view)));
+        }
+        if !chosen_groups.iter().any(|c| c.prefix == g.prefix) {
+            chosen_groups.push(g);
+        }
+    }
+    if chosen_parts.is_empty() && chosen_groups.is_empty() && !sel.precomp {
+        return Err(IoError::Unsupported("no parts or groups selected".into()));
+    }
+
+    // Decode each needed whole part once; groups come from their part's named channels.
+    let mut part_pixels: Vec<Option<Image>> = vec![None; info.len()];
+    let mut layers: Vec<Layer> = Vec::new();
+    let mut warnings: Vec<String> = Vec::new();
+    let mut gray_only = true;
+    let mut max = (1u32, 1u32);
+    let mut f16_seen = false;
+
+    for part in &chosen_parts {
+        let img = match &part_pixels[part.index] {
+            Some(img) => img.clone(),
+            None => {
+                let img = codecs::decode_exr_part(bytes, part.index, &opts)?;
+                part_pixels[part.index] = Some(img.clone());
+                img
+            }
+        };
+        if img.sample_type() == SampleType::F16 {
+            f16_seen = true;
+        }
+        let (surface, mode) = layer_surface(&img, &mut max)?;
+        gray_only &= mode == ColorMode::Grayscale;
+        layers.push(Layer::new(part.name.clone().unwrap_or_else(|| format!("part {}", part.index)), LayerContent::Raster(surface)));
+    }
+    for group in &chosen_groups {
+        let mut names = group.channels.clone();
+        names.extend(group.alpha.clone());
+        let refs: Vec<&str> = names.iter().map(String::as_str).collect();
+        let img = codecs::decode_exr_channels(bytes, group.part, &refs, &opts)?;
+        if img.sample_type() == SampleType::F16 {
+            f16_seen = true;
+        }
+        let (surface, mode) = layer_surface(&img, &mut max)?;
+        gray_only &= mode == ColorMode::Grayscale;
+        layers.push(Layer::new(group.prefix.clone(), LayerContent::Raster(surface)));
+    }
+
+    if sel.precomp {
+        let layer = precomp_layer(bytes, &all_groups, &opts, &mut max, &mut warnings)?;
+        gray_only = false; // the precomp is an RGB layer by construction
+        layers.push(layer);
+    }
+
+    if layers.is_empty() {
+        return Err(IoError::Unsupported("nothing imported".into()));
+    }
+    if f16_seen {
+        warnings.push("16-bit float samples are stored as 32-bit float".to_string());
+    }
+    let mode = if gray_only { ColorMode::Grayscale } else { ColorMode::Rgb };
+    let mut doc = Document::new(name, Size::new(max.0, max.1), mode, DocSample::F32);
+    doc.layers = layers;
+    if mode == ColorMode::Rgb {
+        // OpenEXR holds linear, scene-referred values: tag them linear sRGB, as File › Open does.
+        doc.icc_profile = Some(Builtin::LinearSrgb.profile().to_bytes());
+    }
+    Ok(ImportResult { document: doc, warnings, source_read_only: false, preview_only: false })
+}
+
+/// The additive beauty from the file's AOV groups: premultiplied RGB summed over the
+/// light-path set, alpha the maximum coverage, straightened back. Fails naming the missing
+/// AOVs when the required set is incomplete; AOVs beyond the set are ignored.
+fn precomp_layer(bytes: &[u8], all_groups: &[Group], opts: &DecodeOptions, max: &mut (u32, u32), warnings: &mut Vec<String>) -> Result<Layer, IoError> {
+    let have: Vec<String> = all_groups.iter().map(|g| normalize(&g.prefix)).collect();
+    let missing: Vec<&str> = PRECOMP_REQUIRED.iter().copied().filter(|r| !have.iter().any(|h| h == *r)).collect();
+    if !missing.is_empty() {
+        return Err(IoError::Unsupported(format!("the AOV set is incomplete for a beauty precomp; missing: {}", missing.join(", "))));
+    }
+    let mut sum_rgb: Vec<f32> = Vec::new();
+    let mut alpha: Vec<f32> = Vec::new();
+    let mut size = (0u32, 0u32);
+    for group in all_groups {
+        let n = normalize(&group.prefix);
+        if !PRECOMP_REQUIRED.contains(&n.as_str()) && !PRECOMP_OPTIONAL.contains(&n.as_str()) {
+            continue;
+        }
+        let mut names = group.channels.clone();
+        names.extend(group.alpha.clone());
+        let refs: Vec<&str> = names.iter().map(String::as_str).collect();
+        let img = codecs::decode_exr_channels(bytes, group.part, &refs, opts)?;
+        let rgba = img.convert(ChannelLayout::Rgba, SampleType::F32);
+        let (w, h) = rgba.dimensions();
+        if size == (0, 0) {
+            size = (w, h);
+            sum_rgb = vec![0.0; w as usize * h as usize * 3];
+            alpha = vec![0.0; w as usize * h as usize];
+        } else if size != (w, h) {
+            return Err(IoError::Unsupported("the AOV groups differ in size; a beauty precomp needs one common extent".into()));
+        }
+        let px = rgba.to_f32_samples().unwrap_or_default();
+        for p in 0..(w as usize * h as usize) {
+            // AOV channels are premultiplied by their coverage, as renderers write them:
+            // the sum adds the stored RGB as-is, and alpha is the maximum coverage.
+            let (r, g, b, a) = (px[p * 4], px[p * 4 + 1], px[p * 4 + 2], px[p * 4 + 3]);
+            sum_rgb[p * 3] += r;
+            sum_rgb[p * 3 + 1] += g;
+            sum_rgb[p * 3 + 2] += b;
+            alpha[p] = alpha[p].max(a);
+        }
+    }
+    let (w, h) = size;
+    if w == 0 || h == 0 {
+        return Err(IoError::Unsupported("the AOV groups are empty".into()));
+    }
+    let mut out = vec![0f32; w as usize * h as usize * 4];
+    for p in 0..(w as usize * h as usize) {
+        let a = alpha[p];
+        let (r, g, b) = if a > 0.0 { (sum_rgb[p * 3] / a, sum_rgb[p * 3 + 1] / a, sum_rgb[p * 3 + 2] / a) } else { (0.0, 0.0, 0.0) };
+        out[p * 4] = r;
+        out[p * 4 + 1] = g;
+        out[p * 4 + 2] = b;
+        out[p * 4 + 3] = a;
+    }
+    let img = Image::from_f32(w, h, ChannelLayout::Rgba, &out)?;
+    max.0 = max.0.max(w);
+    max.1 = max.1.max(h);
+    let (surface, _) = layer_surface(&img, max)?;
+    warnings.push("beauty (precomp) is the additive sum of the file's AOVs; alpha is the maximum coverage".to_string());
+    Ok(Layer::new("beauty (precomp)", LayerContent::Raster(surface)))
+}
diff --git a/crates/io/src/flat.rs b/crates/io/src/flat.rs
index cbd4c44c9f..a64af9c71d 100644
--- a/crates/io/src/flat.rs
+++ b/crates/io/src/flat.rs
@@ -146,21 +146,7 @@ pub(crate) fn image_to_document(name: &str, img: &Image) -> Result<ImportResult,
     };
     let (w, h) = img.dimensions();
     let mut doc = Document::new(name, Size::new(w, h), mode, depth);
-    let fmt = PixelFormat::new(mode, depth, true);
-    let mut s = Surface::new(fmt);
-    if img.layout() == target_layout && img.sample_type() == csample {
-        s.write_interleaved(Rect::new(0, 0, w as i32, h as i32), img.data());
-    } else {
-        // Converted a band of rows at a time: no second full-size copy of the image.
-        let row = img.data().len() / (h.max(1) as usize);
-        let band = (BAND_BYTES / row.max(1)).max(1);
-        for (i, rows) in img.data().chunks(row.max(1) * band).enumerate() {
-            let n = (rows.len() / row.max(1)) as u32;
-            let part = Image::from_raw(w, n, img.layout(), img.sample_type(), rows.to_vec())?.convert(target_layout, csample);
-            let y0 = (i * band) as i32;
-            s.write_interleaved(Rect::new(0, y0, w as i32, y0 + n as i32), part.data());
-        }
-    }
+    let mut s = image_surface(img, target_layout, csample)?;
     s.prune();
     // As in Photoshop: an opaque image opens as the locked Background layer, one with
     // transparency (an alpha channel, or a tRNS chunk the decoder expands to one) as a normal
@@ -185,6 +171,37 @@ pub(crate) fn image_to_document(name: &str, img: &Image) -> Result<ImportResult,
     Ok(ImportResult { document: doc, warnings, source_read_only: false, preview_only: false })
 }
 
+/// The pixels of a decoded image as a surface of `fmt`, converting layout and sample type a
+/// band of rows at a time so no second full-size copy of the image is made.
+pub(crate) fn image_surface(img: &Image, target_layout: ChannelLayout, csample: CSample) -> Result<Surface, IoError> {
+    let mode = match target_layout {
+        ChannelLayout::Gray | ChannelLayout::GrayA => ColorMode::Grayscale,
+        ChannelLayout::Cmyk | ChannelLayout::CmykA => ColorMode::Cmyk,
+        _ => ColorMode::Rgb,
+    };
+    let depth = match csample {
+        CSample::U8 => SampleType::U8,
+        CSample::U16 => SampleType::U16,
+        _ => SampleType::F32,
+    };
+    let fmt = PixelFormat::new(mode, depth, true);
+    let (w, h) = img.dimensions();
+    let mut s = Surface::new(fmt);
+    if img.layout() == target_layout && img.sample_type() == csample {
+        s.write_interleaved(Rect::new(0, 0, w as i32, h as i32), img.data());
+    } else {
+        let row = img.data().len() / (h.max(1) as usize);
+        let band = (BAND_BYTES / row.max(1)).max(1);
+        for (i, rows) in img.data().chunks(row.max(1) * band).enumerate() {
+            let n = (rows.len() / row.max(1)) as u32;
+            let part = Image::from_raw(w, n, img.layout(), img.sample_type(), rows.to_vec())?.convert(target_layout, csample);
+            let y0 = (i * band) as i32;
+            s.write_interleaved(Rect::new(0, y0, w as i32, y0 + n as i32), part.data());
+        }
+    }
+    Ok(s)
+}
+
 /// `Some(surface)` when the document is exactly one visible, unmasked,
 /// normal, fully opaque raster layer: its pixels can be written natively
 /// (keeping CMYK / depth exactly) instead of going through the compositor.
diff --git a/crates/io/src/lib.rs b/crates/io/src/lib.rs
index 3d6b766af1..2379edb55b 100644
--- a/crates/io/src/lib.rs
+++ b/crates/io/src/lib.rs
@@ -38,6 +38,7 @@ pub mod blocks;
 mod channel_map;
 pub mod comps_map;
 pub mod effects_map;
+pub mod exr_parts;
 mod flat;
 mod gradient_bake;
 pub mod linked;
diff --git a/crates/ui-egui/src/crop_ui.rs b/crates/ui-egui/src/crop_ui.rs
index 9440b291ca..5115867c89 100644
--- a/crates/ui-egui/src/crop_ui.rs
+++ b/crates/ui-egui/src/crop_ui.rs
@@ -1200,6 +1200,7 @@ mod tests {
             "file.new",
             "file.open",
             "file.openAs",
+            "file.openExrParts",
             "file.closeAll",
             "file.revert",
             "file.export.exportAs",
diff --git a/crates/ui-egui/src/i18n/cs.tsv b/crates/ui-egui/src/i18n/cs.tsv
index be44f4468c..db59bd8154 100644
--- a/crates/ui-egui/src/i18n/cs.tsv
+++ b/crates/ui-egui/src/i18n/cs.tsv
@@ -40,6 +40,11 @@
 	New from Clipboard	Nový ze schránky
 	Open…	Otevřít…
 	Open As…	Otevřít jako…
+	Open EXR Parts…	Otevřít části EXR…
+	Add beauty precomp from the AOVs	Přidat předběžnou kompozici krásy z AOV
+	Both	Obě
+	Left	Vlevo
+	Right	Vpravo
 	Open Recent	Otevřít nedávné
 	Clear Recent Files	Vymazat nedávné soubory
 	Close	Zavřít
@@ -825,7 +830,6 @@
 	Blending Options	Možnosti prolnutí
 	Blue	Modrá
 	Blue, Red, Yellow	Modrá, červená, žlutá
-	Both	Obojí
 	Both Axes	Obě osy
 	Bottom	Dole
 	Brightness	Jas
@@ -1144,7 +1148,6 @@
 	Leading	Proklad
 	Leading (set to the font size × auto-leading when Auto)	Proklad (při volbě Automaticky velikost písma × automatický proklad)
 	Leave as is (don't color manage)	Ponechat beze změny (bez správy barev)
-	Left	Vlevo
 	Left align text	Zarovnat text vlevo
 	Length:	Délka:
 	Level	Úroveň
@@ -1354,7 +1357,6 @@
 	Restore All	Obnovit vše
 	Restore Defaults	Obnovit výchozí
 	Restrictive (Web)	Omezená (web)
-	Right	Vpravo
 	Right align text	Zarovnat text vpravo
 	Rigid	Tuhý
 	Rotate:	Otočení:
diff --git a/crates/ui-egui/src/i18n/de.tsv b/crates/ui-egui/src/i18n/de.tsv
index 9af7a83264..29afc7cfd6 100644
--- a/crates/ui-egui/src/i18n/de.tsv
+++ b/crates/ui-egui/src/i18n/de.tsv
@@ -36,6 +36,11 @@
 	New from Clipboard	Neu aus Zwischenablage
 	Open…	Öffnen…
 	Open As…	Öffnen als…
+	Open EXR Parts…	EXR-Teile öffnen…
+	Add beauty precomp from the AOVs	Schönheits-Vorkomposition aus den AOVs hinzufügen
+	Both	Beide
+	Left	Links
+	Right	Rechts
 	Open Recent	Zuletzt geöffnete Dateien
 	Clear Recent Files	Zuletzt geöffnete Dateien leeren
 	Close	Schließen
@@ -806,7 +811,6 @@
 	Blending Options	Fusionsoptionen
 	Blue	Blau
 	Blue, Red, Yellow	Blau, Rot, Gelb
-	Both	Beide
 	Both Axes	Beide Achsen
 	Bottom	Unten
 	Brightness	Helligkeit
@@ -1128,7 +1132,6 @@
 	Leading	Zeilenabstand
 	Leading (set to the font size × auto-leading when Auto)	Zeilenabstand (bei „Automatisch“ auf Schriftgröße × automatischer Zeilenabstand gesetzt)
 	Leave as is (don't color manage)	Unverändert lassen (keine Farbverwaltung)
-	Left	Links
 	Left align text	Text links ausrichten
 	Length:	Länge:
 	Level	Stufe
@@ -1338,7 +1341,6 @@
 	Restore All	Alle wiederherstellen
 	Restore Defaults	Standardwerte wiederherstellen
 	Restrictive (Web)	Restriktiv (Web)
-	Right	Rechts
 	Right align text	Text rechts ausrichten
 	Rigid	Starr
 	Rotate:	Drehen:
diff --git a/crates/ui-egui/src/i18n/el.tsv b/crates/ui-egui/src/i18n/el.tsv
index 59d769047e..3bd6157fff 100644
--- a/crates/ui-egui/src/i18n/el.tsv
+++ b/crates/ui-egui/src/i18n/el.tsv
@@ -18,6 +18,11 @@
 	New from Clipboard	Νέο από το πρόχειρο
 	Open…	Άνοιγμα…
 	Open As…	Άνοιγμα ως…
+	Open EXR Parts…	Άνοιγμα τμημάτων EXR…
+	Add beauty precomp from the AOVs	Προσθήκη προ-σύνθεσης ομορφιάς από τα AOV
+	Both	Και τα δύο
+	Left	Αριστερά
+	Right	Δεξιά
 	Open Recent	Πρόσφατα αρχεία
 	Clear Recent Files	Εκκαθάριση πρόσφατων αρχείων
 	Close	Κλείσιμο
@@ -438,8 +443,6 @@
 	Alignment	Στοίχιση
 	Align	Στοίχιση
 	Distribute	Κατανομή
-	Left	Αριστερά
-	Right	Δεξιά
 	Center	Κέντρο
 	Top	Πάνω
 	Bottom	Κάτω
@@ -2017,7 +2020,6 @@
 	Bold Italic	Έντονα πλάγια
 	Border	Περίγραμμα
 	Border…	Περίγραμμα…
-	Both	Και τα δύο
 	Both Axes	Και οι δύο άξονες
 	Box Blur	Θόλωση πλαισίου
 	Box Blur…	Θόλωση πλαισίου…
diff --git a/crates/ui-egui/src/i18n/es.tsv b/crates/ui-egui/src/i18n/es.tsv
index 9ebb9b9453..3028a2ba6d 100644
--- a/crates/ui-egui/src/i18n/es.tsv
+++ b/crates/ui-egui/src/i18n/es.tsv
@@ -32,6 +32,11 @@
 	New from Clipboard	Nuevo desde el portapapeles
 	Open…	Abrir…
 	Open As…	Abrir como…
+	Open EXR Parts…	Abrir partes EXR…
+	Add beauty precomp from the AOVs	Añadir la precomposición de belleza a partir de los AOV
+	Both	Ambas
+	Left	Izquierda
+	Right	Derecha
 	Open Recent	Archivos recientes
 	Clear Recent Files	Vaciar archivos recientes
 	Close	Cerrar
@@ -810,7 +815,6 @@
 	Blending Options	Opciones de fusión
 	Blue	Azul
 	Blue, Red, Yellow	Azul, rojo, amarillo
-	Both	Ambos
 	Both Axes	Ambos ejes
 	Bottom	Inferior
 	Brightness	Brillo
@@ -1129,7 +1133,6 @@
 	Leading	Interlínea
 	Leading (set to the font size × auto-leading when Auto)	Interlínea (al estar en Automático se iguala al tamaño de fuente × interlínea automática)
 	Leave as is (don't color manage)	Dejar como está (no gestionar el color)
-	Left	Izquierda
 	Left align text	Alinear texto a la izquierda
 	Length:	Longitud:
 	Level	Nivel
@@ -1339,7 +1342,6 @@
 	Restore All	Restaurar todo
 	Restore Defaults	Restaurar valores predeterminados
 	Restrictive (Web)	Restrictivo (web)
-	Right	Derecha
 	Right align text	Alinear texto a la derecha
 	Rigid	Rígido
 	Rotate:	Rotación:
diff --git a/crates/ui-egui/src/i18n/fr.tsv b/crates/ui-egui/src/i18n/fr.tsv
index 23d730a46b..55ddd1ba2a 100644
--- a/crates/ui-egui/src/i18n/fr.tsv
+++ b/crates/ui-egui/src/i18n/fr.tsv
@@ -38,6 +38,11 @@
 	New…	Nouveau…
 	Open…	Ouvrir…
 	Open As…	Ouvrir en tant que…
+	Open EXR Parts…	Ouvrir les parties EXR…
+	Add beauty precomp from the AOVs	Ajouter la précomposition de la beauté depuis les AOV
+	Both	Les deux
+	Left	Gauche
+	Right	Droite
 	Open Recent	Ouvrir un fichier récent
 	Clear Recent Files	Effacer la liste des fichiers récents
 	Close	Fermer
@@ -800,7 +805,6 @@
 	Blending Options	Options de fusion
 	Blue	Bleu
 	Blue, Red, Yellow	Bleu, rouge, jaune
-	Both	Les deux
 	Both Axes	Deux axes
 	Bottom	Bas
 	Brightness	Luminosité
@@ -1113,7 +1117,6 @@
 	Leading	Interlignage
 	Leading (set to the font size × auto-leading when Auto)	Interlignage (en Auto : taille de police × interlignage automatique)
 	Leave as is (don't color manage)	Laisser tel quel (sans gestion des couleurs)
-	Left	Gauche
 	Left align text	Aligner le texte à gauche
 	Length:	Longueur :
 	Level	Niveau
@@ -1323,7 +1326,6 @@
 	Restore All	Tout restaurer
 	Restore Defaults	Rétablir les valeurs par défaut
 	Restrictive (Web)	Restrictive (Web)
-	Right	Droite
 	Right align text	Aligner le texte à droite
 	Rigid	Rigide
 	Rotate:	Rotation :
diff --git a/crates/ui-egui/src/i18n/id.tsv b/crates/ui-egui/src/i18n/id.tsv
index 8ee55aa62f..fb21511d0e 100644
--- a/crates/ui-egui/src/i18n/id.tsv
+++ b/crates/ui-egui/src/i18n/id.tsv
@@ -31,6 +31,11 @@
 	New…	Baru…
 	Open…	Buka…
 	Open As…	Buka Sebagai…
+	Open EXR Parts…	Buka bagian EXR…
+	Add beauty precomp from the AOVs	Tambahkan prakomposisi beauty dari AOV
+	Both	Keduanya
+	Left	Kiri
+	Right	Kanan
 	Open Recent	Terakhir Dibuka
 	Clear Recent Files	Hapus Daftar Berkas Terakhir
 	Close	Tutup
@@ -794,7 +799,6 @@
 	Blending Options	Opsi Blending
 	Blue	Biru
 	Blue, Red, Yellow	Biru, Merah, Kuning
-	Both	Keduanya
 	Both Axes	Kedua Sumbu
 	Bottom	Bawah
 	Brightness	Kecerahan
@@ -1107,7 +1111,6 @@
 	Leading	Leading
 	Leading (set to the font size × auto-leading when Auto)	Leading (diatur ke ukuran font × auto-leading saat Auto)
 	Leave as is (don't color manage)	Biarkan apa adanya (tanpa manajemen warna)
-	Left	Kiri
 	Left align text	Teks rata kiri
 	Length:	Panjang:
 	Level	Level
@@ -1317,7 +1320,6 @@
 	Restore All	Pulihkan Semua
 	Restore Defaults	Pulihkan Default
 	Restrictive (Web)	Restriktif (Web)
-	Right	Kanan
 	Right align text	Teks rata kanan
 	Rigid	Kaku
 	Rotate:	Putar:
diff --git a/crates/ui-egui/src/i18n/it.tsv b/crates/ui-egui/src/i18n/it.tsv
index 24697c273b..1f1f5d87ab 100644
--- a/crates/ui-egui/src/i18n/it.tsv
+++ b/crates/ui-egui/src/i18n/it.tsv
@@ -32,6 +32,11 @@
 	New from Clipboard	Nuovo dagli appunti
 	Open…	Apri…
 	Open As…	Apri come…
+	Open EXR Parts…	Apri parti EXR…
+	Add beauty precomp from the AOVs	Aggiungi la precomposizione della bellezza dagli AOV
+	Both	Entrambe
+	Left	Sinistra
+	Right	Destra
 	Open Recent	Apri recenti
 	Clear Recent Files	Cancella file recenti
 	Close	Chiudi
@@ -808,7 +813,6 @@
 	Blending Options	Opzioni di fusione
 	Blue	Blu
 	Blue, Red, Yellow	Blu, rosso, giallo
-	Both	Entrambi
 	Both Axes	Entrambi gli assi
 	Bottom	In basso
 	Brightness	Luminosità
@@ -1128,7 +1132,6 @@
 	Leading	Interlinea
 	Leading (set to the font size × auto-leading when Auto)	Interlinea (impostata a dimensione font × interlinea auto quando Auto)
 	Leave as is (don't color manage)	Lascia com'è (non gestire colore)
-	Left	Sinistra
 	Left align text	Allinea testo a sinistra
 	Length:	Lunghezza:
 	Level	Livello
@@ -1338,7 +1341,6 @@
 	Restore All	Ripristina tutto
 	Restore Defaults	Ripristina predefiniti
 	Restrictive (Web)	Restrittivo (web)
-	Right	Destra
 	Right align text	Allinea testo a destra
 	Rigid	Rigido
 	Rotate:	Rotazione:
diff --git a/crates/ui-egui/src/i18n/ja.tsv b/crates/ui-egui/src/i18n/ja.tsv
index 06da72f985..4cc38187af 100644
--- a/crates/ui-egui/src/i18n/ja.tsv
+++ b/crates/ui-egui/src/i18n/ja.tsv
@@ -36,6 +36,11 @@
 	New from Clipboard	クリップボードから新規作成
 	Open…	開く…
 	Open As…	形式を指定して開く…
+	Open EXR Parts…	EXRパートを開く…
+	Add beauty precomp from the AOVs	AOVからビューティーをプリコンポーズして追加
+	Both	両方
+	Left	左
+	Right	右
 	Open Recent	最近使ったファイルを開く
 	Clear Recent Files	最近使ったファイルを消去
 	Close	閉じる
@@ -815,7 +820,6 @@
 	Blending Options	描画オプション
 	Blue	青
 	Blue, Red, Yellow	青、赤、黄
-	Both	両方
 	Both Axes	両方の軸
 	Bottom	下
 	Brightness	明るさ
@@ -1134,7 +1138,6 @@
 	Leading	行送り
 	Leading (set to the font size × auto-leading when Auto)	行送り(自動のときはフォントサイズ × 自動行送り)
 	Leave as is (don't color manage)	そのまま(カラーマネジメントしない)
-	Left	左
 	Left align text	左揃え
 	Length:	長さ:
 	Level	レベル
@@ -1343,7 +1346,6 @@
 	Restore All	すべて復元
 	Restore Defaults	既定に戻す
 	Restrictive (Web)	制限(Web)
-	Right	右
 	Right align text	右揃え
 	Rigid	剛体
 	Rotate:	回転:
diff --git a/crates/ui-egui/src/i18n/ko.tsv b/crates/ui-egui/src/i18n/ko.tsv
index c990751b05..2030f0aa5a 100644
--- a/crates/ui-egui/src/i18n/ko.tsv
+++ b/crates/ui-egui/src/i18n/ko.tsv
@@ -24,6 +24,11 @@
 	New from Clipboard	클립보드에서 새로 만들기
 	Open…	열기…
 	Open As…	형식을 지정하여 열기…
+	Open EXR Parts…	EXR 파트 열기…
+	Add beauty precomp from the AOVs	AOV에서 뷰티 프리컴포지션 추가
+	Both	양쪽
+	Left	왼쪽
+	Right	오른쪽
 	Open Recent	최근 파일 열기
 	Clear Recent Files	최근 파일 목록 지우기
 	Close	닫기
@@ -789,7 +794,6 @@
 	Blending Options	혼합 옵션
 	Blue	파랑
 	Blue, Red, Yellow	파랑, 빨강, 노랑
-	Both	둘 다
 	Both Axes	양쪽 축
 	Bottom	아래쪽
 	Brightness	밝기
@@ -1105,7 +1109,6 @@
 	Leading	행간
 	Leading (set to the font size × auto-leading when Auto)	행간(자동일 때 글꼴 크기 × 자동 행간으로 설정)
 	Leave as is (don't color manage)	그대로 두기(색상 관리 안 함)
-	Left	왼쪽
 	Left align text	텍스트 왼쪽 정렬
 	Length:	길이:
 	Level	레벨
@@ -1314,7 +1317,6 @@
 	Restore All	모두 복원
 	Restore Defaults	기본값 복원
 	Restrictive (Web)	제한됨(웹)
-	Right	오른쪽
 	Right align text	텍스트 오른쪽 정렬
 	Rigid	고정
 	Rotate:	회전:
diff --git a/crates/ui-egui/src/i18n/nl.tsv b/crates/ui-egui/src/i18n/nl.tsv
index 39e25894e0..2eafbf96fb 100644
--- a/crates/ui-egui/src/i18n/nl.tsv
+++ b/crates/ui-egui/src/i18n/nl.tsv
@@ -28,6 +28,11 @@
 	New from Clipboard	Nieuw vanaf klembord
 	Open…	Openen…
 	Open As…	Openen als…
+	Open EXR Parts…	EXR-delen openen…
+	Add beauty precomp from the AOVs	Schoonheidsvoorcompositie toevoegen vanuit de AOV's
+	Both	Beide
+	Left	Links
+	Right	Rechts
 	Open Recent	Recent geopend
 	Clear Recent Files	Recente bestanden wissen
 	Close	Sluiten
@@ -800,7 +805,6 @@
 	Blending Options	Overvloeiopties
 	Blue	Blauw
 	Blue, Red, Yellow	Blauw, rood, geel
-	Both	Beide
 	Both Axes	Beide assen
 	Bottom	Onder
 	Brightness	Helderheid
@@ -1122,7 +1126,6 @@
 	Leading	Interlinie
 	Leading (set to the font size × auto-leading when Auto)	Interlinie (bij Automatisch: lettergrootte × automatische interlinie)
 	Leave as is (don't color manage)	Ongewijzigd laten (geen kleurbeheer)
-	Left	Links
 	Left align text	Tekst links uitlijnen
 	Length:	Lengte:
 	Level	Niveau
@@ -1331,7 +1334,6 @@
 	Restore All	Alles herstellen
 	Restore Defaults	Standaardwaarden herstellen
 	Restrictive (Web)	Beperkt (web)
-	Right	Rechts
 	Right align text	Tekst rechts uitlijnen
 	Rigid	Star
 	Rotate:	Roteren:
diff --git a/crates/ui-egui/src/i18n/pl.tsv b/crates/ui-egui/src/i18n/pl.tsv
index 70d16f46b0..8ffe96000b 100644
--- a/crates/ui-egui/src/i18n/pl.tsv
+++ b/crates/ui-egui/src/i18n/pl.tsv
@@ -35,6 +35,11 @@
 	New from Clipboard	Nowy ze schowka
 	Open…	Otwórz…
 	Open As…	Otwórz jako…
+	Open EXR Parts…	Otwórz części EXR…
+	Add beauty precomp from the AOVs	Dodaj wstępną kompozycję piękna z AOV-ów
+	Both	Obie
+	Left	Lewa
+	Right	Prawa
 	Open Recent	Otwórz ostatnie
 	Clear Recent Files	Wyczyść listę ostatnich plików
 	Close	Zamknij
@@ -812,7 +817,6 @@
 	Blending Options	Opcje mieszania
 	Blue	Niebieski
 	Blue, Red, Yellow	Niebieski, czerwony, żółty
-	Both	Oba
 	Both Axes	Obie osie
 	Bottom	Dół
 	Brightness	Jasność
@@ -1129,7 +1133,6 @@
 	Leading	Interlinia
 	Leading (set to the font size × auto-leading when Auto)	Interlinia (przy ustawieniu Automatycznie: rozmiar czcionki × automatyczna interlinia)
 	Leave as is (don't color manage)	Pozostaw bez zmian (bez zarządzania kolorami)
-	Left	Lewo
 	Left align text	Wyrównaj tekst do lewej
 	Length:	Długość:
 	Level	Poziom
@@ -1338,7 +1341,6 @@
 	Restore All	Przywróć wszystko
 	Restore Defaults	Przywróć domyślne
 	Restrictive (Web)	Ograniczona (Internet)
-	Right	Prawo
 	Right align text	Wyrównaj tekst do prawej
 	Rigid	Sztywne
 	Rotate:	Obrót:
diff --git a/crates/ui-egui/src/i18n/pt-br.tsv b/crates/ui-egui/src/i18n/pt-br.tsv
index 1248becb8d..7c674eb98b 100644
--- a/crates/ui-egui/src/i18n/pt-br.tsv
+++ b/crates/ui-egui/src/i18n/pt-br.tsv
@@ -35,6 +35,11 @@
 	New…	Novo…
 	Open…	Abrir…
 	Open As…	Abrir como…
+	Open EXR Parts…	Abrir partes EXR…
+	Add beauty precomp from the AOVs	Adicionar a pré-composição da beleza a partir dos AOVs
+	Both	Ambas
+	Left	Esquerda
+	Right	Direita
 	Open Recent	Abrir recentes
 	Clear Recent Files	Limpar arquivos recentes
 	Close	Fechar
@@ -797,7 +802,6 @@
 	Blending Options	Opções de mesclagem
 	Blue	Azul
 	Blue, Red, Yellow	Azul, vermelho, amarelo
-	Both	Ambos
 	Both Axes	Ambos os eixos
 	Bottom	Inferior
 	Brightness	Brilho
@@ -1112,7 +1116,6 @@
 	Leading	Entrelinha
 	Leading (set to the font size × auto-leading when Auto)	Entrelinha (no modo Automático, é o tamanho da fonte × entrelinha automática)
 	Leave as is (don't color manage)	Deixar como está (não gerenciar cores)
-	Left	Esquerda
 	Left align text	Alinhar texto à esquerda
 	Length:	Comprimento:
 	Level	Nível
@@ -1322,7 +1325,6 @@
 	Restore All	Restaurar tudo
 	Restore Defaults	Restaurar padrões
 	Restrictive (Web)	Restritiva (Web)
-	Right	Direita
 	Right align text	Alinhar texto à direita
 	Rigid	Rígido
 	Rotate:	Girar:
diff --git a/crates/ui-egui/src/i18n/ru.tsv b/crates/ui-egui/src/i18n/ru.tsv
index 64229d0043..0b1964433e 100644
--- a/crates/ui-egui/src/i18n/ru.tsv
+++ b/crates/ui-egui/src/i18n/ru.tsv
@@ -42,6 +42,11 @@
 	Open…	Открыть…
 	Open	Открыть
 	Open As…	Открыть как…
+	Open EXR Parts…	Открыть части EXR…
+	Add beauty precomp from the AOVs	Добавить предкомпозит красоты из AOV
+	Both	Оба
+	Left	Левый
+	Right	Правый
 	Open Recent	Открыть недавние
 	Clear Recent Files	Очистить список недавних файлов
 	Close	Закрыть
@@ -1078,8 +1083,6 @@
 	Single Word Justification	Выключка одного слова
 	Alignment	Выравнивание
 	Indent First	Отступ первой строки
-	Left	По левому краю
-	Right	По правому краю
 	Center	По центру
 	Justify	По ширине
 
@@ -1930,7 +1933,6 @@
 	Bilinear	Билинейная
 	Black, White	Чёрный, белый
 	Blue, Red, Yellow	Синий, красный, жёлтый
-	Both	Оба
 	Bottom	Снизу
 	Brightness Jitter	Колебание яркости
 	Brush Reconstruct Options	Параметры восстановления кисти
diff --git a/crates/ui-egui/src/i18n/uk.tsv b/crates/ui-egui/src/i18n/uk.tsv
index 36ba349024..4790bb760f 100644
--- a/crates/ui-egui/src/i18n/uk.tsv
+++ b/crates/ui-egui/src/i18n/uk.tsv
@@ -33,6 +33,11 @@
 	Open…	Відкрити…
 	Open	Відкрити
 	Open As…	Відкрити як…
+	Open EXR Parts…	Відкрити частини EXR…
+	Add beauty precomp from the AOVs	Додати попередню композицію краси з AOV
+	Both	Обидва
+	Left	Лівий
+	Right	Правий
 	Open Recent	Нещодавні файли
 	Clear Recent Files	Очистити список нещодавніх файлів
 	Close	Закрити
@@ -1058,8 +1063,6 @@
 	Single Word Justification	Вирівнювання одного слова по ширині
 	Alignment	Вирівнювання
 	Indent First	Відступ першого рядка
-	Left	Ліворуч
-	Right	Праворуч
 	Center	По центру
 	Justify	По ширині
 
@@ -1912,7 +1915,6 @@
 	Bilinear	Білінійна
 	Black, White	Чорний, білий
 	Blue, Red, Yellow	Синій, червоний, жовтий
-	Both	Обидва
 	Bottom	Низ
 	Brightness Jitter	Коливання яскравості
 	Brush Reconstruct Options	Параметри пензля реконструкції
diff --git a/crates/ui-egui/src/i18n/zh-hans.tsv b/crates/ui-egui/src/i18n/zh-hans.tsv
index 0e437e9ba2..9831561136 100644
--- a/crates/ui-egui/src/i18n/zh-hans.tsv
+++ b/crates/ui-egui/src/i18n/zh-hans.tsv
@@ -32,6 +32,11 @@
 	New from Clipboard	从剪贴板新建
 	Open…	打开…
 	Open As…	打开为…
+	Open EXR Parts…	打开 EXR 分段…
+	Add beauty precomp from the AOVs	从 AOV 预合成美丽通道
+	Both	两者
+	Left	左
+	Right	右
 	Open Recent	打开最近文件
 	Clear Recent Files	清除最近文件
 	Close	关闭
@@ -814,7 +819,6 @@
 	Blending Options	混合选项
 	Blue	蓝色
 	Blue, Red, Yellow	蓝色、红色、黄色
-	Both	两者
 	Both Axes	双轴
 	Bottom	底部
 	Brightness	亮度
@@ -1136,7 +1140,6 @@
 	Leading	行距
 	Leading (set to the font size × auto-leading when Auto)	行距（自动时为字号 × 自动行距系数）
 	Leave as is (don't color manage)	保持原样（不进行色彩管理）
-	Left	左
 	Left align text	文字左对齐
 	Length:	长度：
 	Level	级别
@@ -1348,7 +1351,6 @@
 	Restore All	全部还原
 	Restore Defaults	还原默认值
 	Restrictive (Web)	限定（Web）
-	Right	右
 	Right align text	文字右对齐
 	Rigid	刚性
 	Rotate:	旋转：
diff --git a/crates/ui-egui/src/i18n/zh-hant.tsv b/crates/ui-egui/src/i18n/zh-hant.tsv
index 8239f5d85f..38061c68bd 100644
--- a/crates/ui-egui/src/i18n/zh-hant.tsv
+++ b/crates/ui-egui/src/i18n/zh-hant.tsv
@@ -40,6 +40,11 @@
 	New from Clipboard	從剪貼簿新增
 	Open…	開啟…
 	Open As…	開啟為…
+	Open EXR Parts…	開啟 EXR 分段…
+	Add beauty precomp from the AOVs	從 AOV 預合成美麗通道
+	Both	兩者
+	Left	左
+	Right	右
 	Open Recent	最近開啟的檔案
 	Clear Recent Files	清除最近檔案
 	Close	關閉
@@ -816,7 +821,6 @@
 	Blending Options	混合選項
 	Blue	藍色
 	Blue, Red, Yellow	藍色、紅色、黃色
-	Both	兩者
 	Both Axes	兩軸
 	Bottom	下
 	Brightness	亮度
@@ -1135,7 +1139,6 @@
 	Leading	行距
 	Leading (set to the font size × auto-leading when Auto)	行距 (自動時設為字體大小 × 自動行距)
 	Leave as is (don't color manage)	保持原樣 (不進行色彩管理)
-	Left	左
 	Left align text	文字靠左對齊
 	Length:	長度：
 	Level	層級
@@ -1345,7 +1348,6 @@
 	Restore All	全部還原
 	Restore Defaults	還原預設值
 	Restrictive (Web)	限制 (網頁)
-	Right	右
 	Right align text	文字靠右對齊
 	Rigid	剛性
 	Rotate:	旋轉：
diff --git a/crates/ui-egui/src/menu_catalog.rs b/crates/ui-egui/src/menu_catalog.rs
index 37032dbb5f..ad9261b7ec 100644
--- a/crates/ui-egui/src/menu_catalog.rs
+++ b/crates/ui-egui/src/menu_catalog.rs
@@ -7,6 +7,7 @@ pub static CATALOG: &[(&[&str], &str, Option<&str>, &str)] = &[
     (&["File"], "New…", Some("Cmd+N"), "file.new"),
     (&["File"], "Open…", Some("Cmd+O"), "file.open"),
     (&["File"], "Open As…", Some("Cmd+Alt+Shift+O"), "file.openAs"),
+    (&["File"], "Open EXR Parts…", None, "file.openExrParts"),
     (&["File"], "---", None, "---"),
     (&["File"], "Close", Some("Cmd+W"), "file.close"),
     (&["File"], "Close All", Some("Cmd+Alt+W"), "file.closeAll"),
diff --git a/crates/ui-egui/src/view_cmds.rs b/crates/ui-egui/src/view_cmds.rs
index 3aa4a7957d..cfe31e540c 100644
--- a/crates/ui-egui/src/view_cmds.rs
+++ b/crates/ui-egui/src/view_cmds.rs
@@ -714,6 +714,59 @@ pub fn cells(layout: &str, rect: egui::Rect, n: usize) -> Option<Vec<egui::Rect>
 // ---------- dialogs and pickers in front of engine commands ----------
 
 /// A generic form dialog that runs `command` with its fields on OK (rendered by [`form_body`]).
+/// File › Open EXR Parts…: pick an EXR, then choose the parts and channel groups that become
+/// the layers of one document (a Maya/Arnold render writes one part per AOV). The dialog is
+/// a plain command form, so the control channel can drive the same selection headlessly.
+fn open_exr_parts_dialog(app: &mut PhotocraftApp) -> Option<Result<Value, String>> {
+    Some(app.pick_file_bytes_filtered(&["exr"], |app, name, _bytes| {
+        let info = app.run("file.exrParts", json!({"path": name})).map_err(|e| e.to_string())?;
+        let entries = info.as_array().cloned().unwrap_or_default();
+        let mut fields = Map::new();
+        fields.insert("path".into(), json!(name));
+        fields.insert("view".into(), json!("both"));
+        fields.insert("precomp".into(), json!(false));
+        let mut labels = Map::new();
+        // The path field shows the picked file's name (data, verbatim); the rest translate.
+        if let Some(file) = name.rsplit(['/', '\\']).next() {
+            labels.insert("path".into(), json!(file));
+        }
+        labels.insert("view".into(), json!(crate::i18n::t("View")));
+        labels.insert("both".into(), json!(crate::i18n::t("Both")));
+        labels.insert("left".into(), json!(crate::i18n::t("Left")));
+        labels.insert("right".into(), json!(crate::i18n::t("Right")));
+        labels.insert("precomp".into(), json!(crate::i18n::t("Add beauty precomp from the AOVs")));
+        let mut any = false;
+        for e in &entries {
+            let kind = e["kind"].as_str().unwrap_or_default().to_string();
+            let ename = e["name"].as_str().unwrap_or_default().to_string();
+            let channels = e["channels"].as_u64().unwrap_or(0);
+            let key = format!("{kind}/{ename}");
+            match kind.as_str() {
+                "part" => {
+                    labels.insert(key.clone(), json!(format!("{ename} ({}×{}, {channels} ch)", e["width"], e["height"])));
+                    let on = !any && channels >= 3;
+                    any |= on;
+                    fields.insert(key, json!(on));
+                }
+                "group" => {
+                    labels.insert(key.clone(), json!(format!("{ename} ({channels} ch)")));
+                    fields.insert(key, json!(false));
+                }
+                _ => {}
+            }
+        }
+        // Cryptomatte layers are information here (the picker comes separately); the array is
+        // not rendered but rides along for the control channel.
+        let crypto: Vec<Value> = entries.iter().filter(|e| e["kind"] == "cryptomatte").cloned().collect();
+        if !crypto.is_empty() {
+            fields.insert("cryptomatte".into(), Value::Array(crypto));
+        }
+        fields.insert("__labels".into(), Value::Object(labels));
+        let choices = json!({"view": ["both", "left", "right"]});
+        Ok(json!({"dialog": form(app, "file.openExrParts", "Open EXR Parts…", Value::Object(fields), choices)}))
+    }))
+}
+
 fn form(app: &mut PhotocraftApp, command: &str, label: &str, fields: Value, choices: Value) -> u64 {
     let mut f = Map::new();
     f.insert("__command".into(), json!(command));
@@ -764,6 +817,10 @@ mod label_tests {
 /// Body of a `__form` dialog: text fields, number fields, checkboxes and `__choices` dropdowns.
 pub fn form_body(ui: &mut egui::Ui, f: &mut Map<String, Value>) {
     let choices = f.get("__choices").cloned().unwrap_or(Value::Null);
+    // Data-driven labels (a per-part checkbox shows the part's name, not a catalogue entry)
+    // come from `__labels` verbatim; everything else goes through the catalogue.
+    let labels = f.get("__labels").cloned().unwrap_or(Value::Null);
+    let label = |k: &str| labels.get(k).and_then(Value::as_str).map_or_else(|| label_of(k), str::to_string);
     let keys: Vec<String> = f.keys().filter(|k| !k.starts_with("__")).cloned().collect();
     egui::Grid::new("form-dialog").num_columns(2).spacing([12.0, 6.0]).show(ui, |ui| {
         for k in keys {
@@ -773,11 +830,11 @@ pub fn form_body(ui: &mut egui::Ui, f: &mut Map<String, Value>) {
                 Value::Bool(b) => {
                     ui.label("");
                     let mut b = *b;
-                    ui.checkbox(&mut b, label_of(&k));
+                    ui.checkbox(&mut b, label(&k));
                     json!(b)
                 }
                 Value::String(s) => {
-                    ui.label(label_of(&k));
+                    ui.label(label(&k));
                     let mut s = s.clone();
                     match choices.get(&k).and_then(Value::as_array) {
                         Some(opts) => {
@@ -792,7 +849,7 @@ pub fn form_body(ui: &mut egui::Ui, f: &mut Map<String, Value>) {
                     json!(s)
                 }
                 Value::Number(n) => {
-                    ui.label(label_of(&k));
+                    ui.label(label(&k));
                     if let Some(mut i) = n.as_i64() {
                         ui.add(egui::DragValue::new(&mut i).custom_parser(crate::widgets::parse_num));
                         json!(i)
@@ -849,6 +906,7 @@ fn front(app: &mut PhotocraftApp, id: &str, params: &Value) -> Option<Result<Val
     let dialog = |app: &mut PhotocraftApp, fields: Value, choices: Value| Some(Ok(json!({"dialog": form(app, id, label, fields, choices)})));
     match id {
         "file.openAs" => Some(app.open_dialog_file()),
+        "file.openExrParts" => open_exr_parts_dialog(app),
         "file.saveACopy" => Some(save_a_copy(app)),
         "file.placeEmbedded" | "file.placeLinked" => {
             let doc = match app.active_doc_id() {
diff --git a/docs/parity.md b/docs/parity.md
index 9394b6b6fc..9eb50a908c 100644
--- a/docs/parity.md
+++ b/docs/parity.md
@@ -2,11 +2,11 @@
 
 Generated by `cargo xtask parity` from `crates/ui-egui/src/menu_catalog.rs` (Photoshop's menu tree) and the live command registry. Do not edit by hand.
 
-**627 of 627 menu items live (100.0%).**
+**628 of 628 menu items live (100.0%).**
 
 | Menu | Live | Total | % |
 |---|---:|---:|---:|
-| File | 51 | 51 | 100% |
+| File | 52 | 52 | 100% |
 | Edit | 75 | 75 | 100% |
 | Image | 61 | 61 | 100% |
 | Layer | 161 | 161 | 100% |
diff --git a/docs/scorecard.md b/docs/scorecard.md
index 5acc894359..324914c6ea 100644
--- a/docs/scorecard.md
+++ b/docs/scorecard.md
@@ -11,7 +11,7 @@ Generated by `cargo xtask scorecard` from `perf/budgets.toml`, `perf/baseline.js
 | [Tools](#tools) | 20 | 15 | 6 |  |
 | [Workspace and UI](#workspace-and-ui) | 6 | 7 | 10 | settings that do nothing: 46 of 149 (target 0) |
 | [Type](#type) | 0 | 3 | 6 |  |
-| [Automation](#automation) | 3 | 2 | 6 | 627 of 627 menu items live (100.0%) |
+| [Automation](#automation) | 3 | 2 | 6 | 628 of 628 menu items live (100.0%) |
 | [Reliability](#reliability) | 5 | 2 | 0 | never-crash lints on 28 of 28 crates; panic_hunt present |
 | [Distribution](#distribution) | 4 | 4 | 3 |  |
 | [Open bugs](#open-bugs) | 22 | 2 | 8 |  |
@@ -220,7 +220,7 @@ Unread: `general.color_picker`, `general.beep_when_done`, `general.resize_image_
 
 ## Automation
 
-Menu wiring (`docs/parity.md`): 627 of 627 menu items live (100.0%). This counts dispatch, not behaviour.
+Menu wiring (`docs/parity.md`): 628 of 628 menu items live (100.0%). This counts dispatch, not behaviour.
 
 | Id | Target | Status | Issue | Note |
 |---|---|---|---|---|