diff --git a/scripts/after-pack.cjs b/scripts/after-pack.cjs
index a804e97..eadebab 100644
--- a/scripts/after-pack.cjs
+++ b/scripts/after-pack.cjs
@@ -88,7 +88,9 @@ function validateAsarRuntimeDependencies(runtimeResources) {
   const asarPath = path.join(runtimeResources, 'app.asar')
   if (!existsSync(asarPath)) throw new Error(`Missing packaged application archive: ${asarPath}`)
 
-  const entries = new Set(asar.listPackage(asarPath))
+  // @electron/asar returns platform-native separators. Normalize to POSIX
+  // paths so validation behaves consistently on Windows and macOS/Linux.
+  const entries = new Set(asar.listPackage(asarPath).map((entry) => entry.replaceAll('\\', '/')))
   const missingPackages = REQUIRED_RUNTIME_PACKAGES.filter(
     (packageName) => !entries.has(`/node_modules/${packageName}/package.json`)
   )
diff --git a/tests/unit/runtime-packaging.test.ts b/tests/unit/runtime-packaging.test.ts
index 43de4c5..2768da1 100644
--- a/tests/unit/runtime-packaging.test.ts
+++ b/tests/unit/runtime-packaging.test.ts
@@ -71,6 +71,30 @@ describe('production runtime packaging', () => {
     )
   })
 
+  it('accepts runtime dependencies when asar uses Windows path separators', async () => {
+    const resources = join(root, 'asar-complete-resources')
+    const source = join(root, 'asar-complete-source')
+    const packages = [
+      '@electron-toolkit/preload',
+      '@electron-toolkit/utils',
+      'archiver',
+      'electron-updater',
+      'ffmpeg-static',
+      'fs-extra',
+      'jsonrepair',
+      'koffi'
+    ]
+    for (const packageName of packages) {
+      const packagePath = join(source, 'node_modules', ...packageName.split('/'))
+      mkdirSync(packagePath, { recursive: true })
+      writeFileSync(join(packagePath, 'package.json'), '{}')
+    }
+    mkdirSync(resources, { recursive: true })
+    await asar.createPackage(source, join(resources, 'app.asar'))
+
+    expect(() => validateAsarRuntimeDependencies(resources)).not.toThrow()
+  })
+
   it('requires and unpacks the bundled ffmpeg-static executable', () => {
     const resources = join(root, 'ffmpeg-resources')
     const ffmpegPath = join(