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Extension Can’t Connect to Native Host

  1. Verify the Extension ID in com.notepad.launcher.json matches your actual ID exactly.
  2. Check the path in the manifest points to the correct file location.
  3. Ensure Python is in your PATH: python --version
  4. Confirm the registry was properly updated (Windows).
  5. Restart Edge/Chrome after making any changes.

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Python Not Found

  • Install Python from python.org
  • On Windows, use native_host.bat instead of native_host.py in the manifest, and update the batch file to use the full path to python.exe

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Permission Denied (Linux / macOS)

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Registry Changes Don’t Take Effect (Windows)

  1. Fully close Edge (check Task Manager — kill all msedge.exe processes)
  2. Double-click the .reg file again
  3. Restart Edge

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Debugging

Native host:
  1. Uncomment the logging code in native_host.py
  2. Check the log file for errors
  3. Test the script manually from the command line
Extension:
  1. Open edge://extensions/
  2. Click Inspect views: service worker under your extension
  3. Check the console for error messages