ERROR_MUI_FILE_NOT_FOUND 0x80073AFC

What it means

ERROR_MUI_FILE_NOT_FOUND is a Windows error code (system error 15100, returned as HRESULT 0x80073AFC) reported by Windows. Its official message is: “The resource loader failed to find MUI file.”

How to fix ERROR_MUI_FILE_NOT_FOUND

1. Verify the path/file actually exists and is not blocked by antivirus quarantine
2. Reinstall the application that raised the error to restore missing files
3. Check the full path spelling (long paths >260 chars need a registry opt-in)
4. Run the Windows Update troubleshooter (Settings → System → Troubleshoot → Other tools)
5. Reset update components: stop 'wuauserv' and 'bits', clear C:\Windows\SoftwareDistribution, restart both services
6. Verify system file integrity with 'sfc /scannow'

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