diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index e762060..682cccf 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -100,6 +100,25 @@ jobs:
             - name: Build extension
               if: env.VS_EXISTS == 'false' || env.OVSX_EXISTS == 'false'
               run: vsce package --no-dependencies -o postscript-preview-${{ steps.package-version.outputs.current-version }}.vsix
+            - name: Build Open VSX extension
+              if: env.OVSX_EXISTS == 'false'
+              run: |
+                  cp package.json "$RUNNER_TEMP/postscript-preview-package.json"
+                  trap 'cp "$RUNNER_TEMP/postscript-preview-package.json" package.json' EXIT
+                  node scripts/prepare-open-vsx-manifest.mjs package.json
+                  vsce package --no-dependencies -o postscript-preview-${{ steps.package-version.outputs.current-version }}-open-vsx.vsix
+            - name: Validate registry packages
+              if: env.OVSX_EXISTS == 'false'
+              run: |
+                  unzip -p postscript-preview-${{ steps.package-version.outputs.current-version }}.vsix extension/package.json |
+                    jq -e '.extensionDependencies | index("mxschmitt.postscript") != null'
+                  unzip -p postscript-preview-${{ steps.package-version.outputs.current-version }}-open-vsx.vsix extension/package.json |
+                    jq -e '(.extensionDependencies // []) | index("mxschmitt.postscript") == null'
+                  if unzip -p postscript-preview-${{ steps.package-version.outputs.current-version }}-open-vsx.vsix extension.vsixmanifest |
+                    grep --fixed-strings --quiet 'mxschmitt.postscript'; then
+                      echo "Open VSX package still declares the unavailable dependency" >&2
+                      exit 1
+                  fi
             - name: Upload a Build Artifact
               if: env.VS_EXISTS == 'false' || env.OVSX_EXISTS == 'false'
               uses: actions/upload-artifact@v7
@@ -136,7 +155,7 @@ jobs:
               if: env.OVSX_EXISTS == 'false'
               env:
                   OVSX_PAT: ${{ secrets.OPEN_VSX_TOKEN }}
-              run: ovsx publish "postscript-preview-${{ steps.package-version.outputs.current-version }}.vsix" --pat "$OVSX_PAT"
+              run: ovsx publish "postscript-preview-${{ steps.package-version.outputs.current-version }}-open-vsx.vsix" --pat "$OVSX_PAT"
             - name: Publish to Visual Studio Marketplace
               if: env.VS_EXISTS == 'false'
               env:
diff --git a/.vscodeignore b/.vscodeignore
index 41155b2..2b15376 100644
--- a/.vscodeignore
+++ b/.vscodeignore
@@ -28,6 +28,7 @@ ANTIGRAVITY.md
 TESTING.md
 docs/**
 examples/**
+scripts/**
 CODE_OF_CONDUCT.md
 CONTRIBUTING.md
 generateEmojiShortcodeMap.js
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 64b024e..fef4af2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@
 
 ### Fixes
 
+-   Published an Open VSX-specific package without the unavailable PostScript language dependency while preserving automatic dependency installation in the Visual Studio Marketplace.
 -   Made Windows PostScript conversion use the native Ghostscript executable without a command shell.
 -   Escaped filenames rendered in the preview and improved single-page and accessible pagination layouts.
 
diff --git a/package.json b/package.json
index 641f79c..4046cb0 100644
--- a/package.json
+++ b/package.json
@@ -76,8 +76,9 @@
 		"compile": "yarn clean && tsc -p ./",
 		"lint": "eslint src",
 		"watch": "tsc -watch -p ./",
-		"test": "yarn compile && mocha --ui tdd --color --timeout 10000 \"out/test/unit/**/*.test.js\" && node ./out/test/runTest.js",
-		"test:unit": "yarn compile && mocha --ui tdd --color --timeout 10000 \"out/test/unit/**/*.test.js\"",
+		"test": "yarn compile && yarn test:tools && mocha --ui tdd --color --timeout 10000 \"out/test/unit/**/*.test.js\" && node ./out/test/runTest.js",
+		"test:tools": "node --test scripts/prepare-open-vsx-manifest.test.mjs",
+		"test:unit": "yarn compile && yarn test:tools && mocha --ui tdd --color --timeout 10000 \"out/test/unit/**/*.test.js\"",
 		"test:integration": "yarn compile && node ./out/test/runTest.js"
 	},
 	"devDependencies": {
diff --git a/scripts/prepare-open-vsx-manifest.mjs b/scripts/prepare-open-vsx-manifest.mjs
new file mode 100644
index 0000000..ffb2237
--- /dev/null
+++ b/scripts/prepare-open-vsx-manifest.mjs
@@ -0,0 +1,40 @@
+import { readFile, writeFile } from "node:fs/promises";
+import { pathToFileURL } from "node:url";
+
+const unavailableOpenVsxDependencies = new Set(["mxschmitt.postscript"]);
+
+export function createOpenVsxManifest(manifest) {
+    const openVsxManifest = { ...manifest };
+    const availableDependencies = manifest.extensionDependencies?.filter(
+        (dependency) => !unavailableOpenVsxDependencies.has(dependency)
+    );
+
+    if (availableDependencies?.length) {
+        openVsxManifest.extensionDependencies = availableDependencies;
+    } else {
+        delete openVsxManifest.extensionDependencies;
+    }
+
+    return openVsxManifest;
+}
+
+async function prepareOpenVsxManifest(manifestPath) {
+    const manifest = JSON.parse(await readFile(manifestPath, "utf8"));
+    const openVsxManifest = createOpenVsxManifest(manifest);
+    await writeFile(
+        manifestPath,
+        `${JSON.stringify(openVsxManifest, null, "\t")}\n`,
+        "utf8"
+    );
+}
+
+if (
+    process.argv[1] &&
+    import.meta.url === pathToFileURL(process.argv[1]).href
+) {
+    const manifestPath = process.argv[2];
+    if (!manifestPath) {
+        throw new Error("Usage: prepare-open-vsx-manifest.mjs <package.json>");
+    }
+    await prepareOpenVsxManifest(manifestPath);
+}
diff --git a/scripts/prepare-open-vsx-manifest.test.mjs b/scripts/prepare-open-vsx-manifest.test.mjs
new file mode 100644
index 0000000..a7a3f8e
--- /dev/null
+++ b/scripts/prepare-open-vsx-manifest.test.mjs
@@ -0,0 +1,37 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+import { createOpenVsxManifest } from "./prepare-open-vsx-manifest.mjs";
+
+test("removes unavailable extension dependencies from the Open VSX manifest", () => {
+    const marketplaceManifest = {
+        name: "postscript-preview",
+        version: "0.6.1",
+        extensionDependencies: ["mxschmitt.postscript"],
+    };
+
+    const openVsxManifest = createOpenVsxManifest(marketplaceManifest);
+
+    assert.deepEqual(openVsxManifest, {
+        name: "postscript-preview",
+        version: "0.6.1",
+    });
+    assert.deepEqual(marketplaceManifest.extensionDependencies, [
+        "mxschmitt.postscript",
+    ]);
+});
+
+test("preserves dependencies that can be resolved by Open VSX", () => {
+    const marketplaceManifest = {
+        name: "postscript-preview",
+        extensionDependencies: [
+            "mxschmitt.postscript",
+            "example.available-extension",
+        ],
+    };
+
+    const openVsxManifest = createOpenVsxManifest(marketplaceManifest);
+
+    assert.deepEqual(openVsxManifest.extensionDependencies, [
+        "example.available-extension",
+    ]);
+});