While you can install the Xvid codec for MX Player on Windows 10, the results in 2021 are inconsistent at best. Microsoft’s security updates and the sandboxed nature of Store apps make system-wide codecs nearly obsolete.

While the Xvid codec represents a legacy era of digital video, it remains a necessary component for archival playback. For Windows 10 users in 2021, the optimal implementation is .

which integrates into most Windows-based media players, including the Microsoft Store version of MX Player. Key Features for Windows 10 High-Quality Compression

Once installed, the Xvid decoder is registered with Windows. MX Player will be able to utilize this system codec to play your files smoothly.

Windows 10 power saving mode is throttling the decoder. Solution: Go to Windows Settings → System → Power & Sleep → Additional power settings → Choose High performance plan.