fix

tools/post-build-rcedit.js

@@ -37,9 +37,9 @@ if (localBin) {
   cmd = localBin;
   args = [exePath, '--set-icon', iconPath];
 } else {
-  // Fallback to npx. Note: Node can't execute PowerShell shims (npx.ps1), so this may fail
-  // in environments that only provide .ps1 launchers.
-  cmd = 'npx';
+  // Fallback to npx. Use the platform-specific shim on Windows so Node spawn finds it.
+  // PowerShell-only shims like npx.ps1 won't work with Node spawn; prefer npx.cmd.
+  cmd = process.platform === 'win32' ? 'npx.cmd' : 'npx';
   args = ['rcedit', exePath, '--set-icon', iconPath];
 }