diff --git a/.github/workflows/identify-dxvk.yml b/.github/workflows/identify-dxvk.yml
new file mode 100644
index 0000000..a5e0afb
--- /dev/null
+++ b/.github/workflows/identify-dxvk.yml
@@ -0,0 +1,36 @@
+name: One-time DXVK identify
+
+on:
+  push:
+    branches:
+      - feature/client-tweaks
+    paths:
+      - .github/workflows/identify-dxvk.yml
+
+permissions:
+  contents: read
+
+jobs:
+  identify:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Compare bundled d3d9 against official DXVK releases
+        shell: bash
+        run: |
+          set -euo pipefail
+          echo "Bundled:"
+          sha256sum Payload/DXVK_Standard/d3d9.dll
+          stat -c '%s bytes' Payload/DXVK_Standard/d3d9.dll
+
+          for ver in 2.6 2.6.1 2.6.2; do
+            echo
+            echo "DXVK $ver"
+            curl -fL --retry 3 -o "/tmp/dxvk-$ver.tar.gz"               "https://github.com/doitsujin/dxvk/releases/download/v$ver/dxvk-$ver.tar.gz"
+            tar -xzf "/tmp/dxvk-$ver.tar.gz" -C /tmp
+            sha256sum "/tmp/dxvk-$ver/x32/d3d9.dll"
+            stat -c '%s bytes' "/tmp/dxvk-$ver/x32/d3d9.dll"
+            cmp -s Payload/DXVK_Standard/d3d9.dll "/tmp/dxvk-$ver/x32/d3d9.dll"               && echo "MATCH=v$ver" || echo "NO_MATCH=v$ver"
+            rm -rf "/tmp/dxvk-$ver" "/tmp/dxvk-$ver.tar.gz"
+          done