The audio10.diagcab file is a relic of an older era of Windows troubleshooting, but it remains a powerful first-response tool. In 2025, Windows 11 has started shifting toward the "Get Help" app and cloud-based diagnostics. However, the audio10.diagcab engine still runs in the background whenever you click "Troubleshoot sound problems."
Open CMD as Admin and paste these three commands one by one: audio10.diagcab
You can also run it silently: