fix

package.json

@@ -10,6 +10,7 @@
   },
   "devDependencies": {
     "@tauri-apps/cli": "^2",
+    "npx": "^3.0.0",
     "rcedit": "^1.1.2"
   }
 }

sidecar/package-lock.json

@@ -9,6 +9,9 @@
       "version": "1.0.0",
       "dependencies": {
         "castv2-client": "^1.2.0"
+      },
+      "bin": {
+        "radiocast-sidecar": "index.js"
       }
     },
     "node_modules/@protobufjs/aspromise": {

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];
 }