`vpx` runs Unix binary on Windows instead of `.cmd` file

[tobynguyen27]

Describe the bug

When running vpx on Windows, it looks for extensionless binary first on all platforms (including Windows). Since that file exists, it returns the Unix script path and Windows can't run it. The .cmd fallback is never reached.

Reproduction

https://github.com/tobynguyen27/vpx-error/actions/runs/26212898208/job/77127912271

Steps to reproduce

Run vpx playwright install --with-deps on Windows or check the GitHub Actions CI

System Info

VITE+ - The Unified Toolchain for the Web

Environment:
  Version       24.15.0
  Source        engines.node
  Source Path   /home/toby/Workspace/vpx-error/package.json
  Project Root  /home/toby/Workspace/vpx-error

Tool Paths:
  node  /home/toby/.vite-plus/js_runtime/node/24.15.0/bin/node
  npm   /home/toby/.vite-plus/js_runtime/node/24.15.0/bin/npm
  npx   /home/toby/.vite-plus/js_runtime/node/24.15.0/bin/npx

VITE+ - The Unified Toolchain for the Web

vp v0.1.22

Local vite-plus:
  vite-plus  v0.1.21

Tools:
  vite             v8.0.11
  rolldown         v1.0.0
  vitest           v4.1.5
  oxfmt            v0.48.0
  oxlint           v1.63.0
  oxlint-tsgolint  v0.22.1
  tsdown           v0.22.0

Environment:
  Package manager  pnpm v11.1.2
  Node.js          v24.15.0 (engines.node)

Used Package Manager

pnpm

Logs

Validations

• Read the Contributing Guidelines.
• Check that there isn't already an issue for the same bug.
• Confirm this is a Vite+ issue and not an upstream issue (Vite, Vitest, tsdown, Rolldown, or Oxc).
• The provided reproduction is a minimal reproducible example.