diff --git a/packaging/check-app-specific.sh b/packaging/check-app-specific.sh
index c14ca5725..3b84227f2 100644
--- a/packaging/check-app-specific.sh
+++ b/packaging/check-app-specific.sh
@@ -22,3 +22,41 @@ for key in ("runtime", "runtime-version", "sdk", "finish-args"):
     assert manifests[0][key] == manifests[1][key], f"Flatpak manifests disagree on {key}"
 print("LightCraft package identity ok")
 PYEOF
+
+# The macOS bundle must declare only file types LightCraft can open. It used to carry PhotoCraft's
+# `.pcraft` document type and imported PSB/QOI declarations, so Launch Services typed PhotoCraft
+# documents as LightCraft's and `.pcraft` had three claimant apps (issue #1951). plistlib parses the
+# template as a property list too, which is the syntax check package.sh's `plutil -lint` repeats on
+# the substituted file.
+python3 - <<'PYEOF'
+import plistlib
+with open("packaging/macos/Info.plist.in", "rb") as source:
+    plist = plistlib.load(source)
+for key, value in {
+    "CFBundleIdentifier": "ai.storyteller.lightcraft",
+    "CFBundleExecutable": "LightCraft",
+    "CFBundleIconFile": "LightCraft",
+    "LSMinimumSystemVersion": "11.0",
+}.items():
+    assert plist.get(key) == value, f"Info.plist {key}: {plist.get(key)!r}, expected {value!r}"
+for key in ("CFBundleShortVersionString", "CFBundleVersion", "LightCraftVersion", "LightCraftBuildCommit"):
+    assert plist.get(key), f"Info.plist lost {key}"
+declared = set()
+for section in ("UTExportedTypeDeclarations", "UTImportedTypeDeclarations"):
+    for entry in plist.get(section, []):
+        tags = entry.get("UTTypeTagSpecification", {})
+        declared.update(tags.get("public.filename-extension", []))
+        declared.update(tags.get("public.mime-type", []))
+        declared.add(entry.get("UTTypeIdentifier", ""))
+unsupported = {name.lower() for name in declared} & {
+    "pcraft",
+    "psb",
+    "qoi",
+    "application/x-lightcraft",
+    "ai.storyteller.lightcraft.document",
+    "ai.storyteller.lightcraft.qoi",
+    "com.adobe.photoshop-large-image",
+}
+assert not unsupported, f"Info.plist declares types LightCraft cannot open: {sorted(unsupported)}"
+print("LightCraft macOS bundle types ok")
+PYEOF
diff --git a/packaging/macos/Info.plist.in b/packaging/macos/Info.plist.in
index 03220ab0a..fd87f601e 100644
--- a/packaging/macos/Info.plist.in
+++ b/packaging/macos/Info.plist.in
@@ -49,66 +49,11 @@
   <key>NSHumanReadableCopyright</key>
   <string>Copyright © the LightCraft authors. MIT OR Apache-2.0.</string>
 
-  <!-- Lightcraft's own format. -->
-  <key>UTExportedTypeDeclarations</key>
-  <array>
-    <dict>
-      <key>UTTypeIdentifier</key>
-      <string>ai.storyteller.lightcraft.document</string>
-      <key>UTTypeDescription</key>
-      <string>LightCraft Document</string>
-      <key>UTTypeConformsTo</key>
-      <array>
-        <string>public.data</string>
-        <string>public.image</string>
-      </array>
-      <key>UTTypeIconFile</key>
-      <string>LightCraft</string>
-      <key>UTTypeTagSpecification</key>
-      <dict>
-        <key>public.filename-extension</key>
-        <array><string>pcraft</string></array>
-        <key>public.mime-type</key>
-        <array><string>application/x-lightcraft</string></array>
-      </dict>
-    </dict>
-  </array>
-  <!-- Types macOS may not know; the system's own declaration wins when it has one. -->
-  <key>UTImportedTypeDeclarations</key>
-  <array>
-    <dict>
-      <key>UTTypeIdentifier</key>
-      <string>com.adobe.photoshop-large-image</string>
-      <key>UTTypeDescription</key>
-      <string>Photoshop Large Document</string>
-      <key>UTTypeConformsTo</key>
-      <array>
-        <string>public.data</string>
-        <string>public.image</string>
-      </array>
-      <key>UTTypeTagSpecification</key>
-      <dict>
-        <key>public.filename-extension</key>
-        <array><string>psb</string></array>
-      </dict>
-    </dict>
-    <dict>
-      <key>UTTypeIdentifier</key>
-      <string>ai.storyteller.lightcraft.qoi</string>
-      <key>UTTypeDescription</key>
-      <string>QOI Image</string>
-      <key>UTTypeConformsTo</key>
-      <array>
-        <string>public.data</string>
-        <string>public.image</string>
-      </array>
-      <key>UTTypeTagSpecification</key>
-      <dict>
-        <key>public.filename-extension</key>
-        <array><string>qoi</string></array>
-      </dict>
-    </dict>
-  </array>
+  <!-- No UTI declarations: LightCraft has no document type of its own, and the formats it opens
+       (JPEG, PNG, TIFF, HEIC, the raw formats) are declared by the system or by another app.
+       Declaring PhotoCraft's `.pcraft` type here (and importing PSB and QOI) made Launch Services
+       type PhotoCraft documents as LightCraft's; `.pcraft` ended up with three claimant apps
+       (issue #1951). -->
 
 </dict>
 </plist>