diff --git a/.github/workflows/rust-release-windows.yml b/.github/workflows/rust-release-windows.yml
index 228f68949..a93577c45 100644
--- a/.github/workflows/rust-release-windows.yml
+++ b/.github/workflows/rust-release-windows.yml
@@ -277,13 +277,24 @@ jobs:
         shell: bash
         run: |
           set -euo pipefail
-          for bundle in primary app-server; do
-            bash "${GITHUB_WORKSPACE}/.github/scripts/build-codex-package-archive.sh" \
-              --target "${{ matrix.target }}" \
-              --bundle "$bundle" \
-              --entrypoint-dir "target/${{ matrix.target }}/release" \
-              --archive-dir "dist/${{ matrix.target }}"
-          done
+          target="${{ matrix.target }}"
+          archive_script="${GITHUB_WORKSPACE}/.github/scripts/build-codex-package-archive.sh"
+          temp_root="${RUNNER_TEMP}/codex-package-archives"
+
+          # The package helper rewrites cached DotSlash executables. Keep the
+          # concurrent processes in separate temp roots because Windows cannot
+          # replace an executable while another process is using it.
+          mkdir -p "$temp_root/primary" "$temp_root/app-server"
+          printf '%s\0' primary app-server |
+            xargs -0 -P0 -I{} env \
+              TMPDIR="$temp_root/{}" \
+              TMP="$temp_root/{}" \
+              TEMP="$temp_root/{}" \
+              bash "$archive_script" \
+                --target "$target" \
+                --bundle "{}" \
+                --entrypoint-dir "target/$target/release" \
+                --archive-dir "dist/$target"
 
       - name: Build Python runtime wheel
         shell: bash