Fix NS_E_WMP_MSSAP_NOT_AVAILABLE (0XC00D11A3) on Windows Media Player

This error is a pain, I know

You're trying to play a video or audio file in Windows Media Player, and instead you get NS_E_WMP_MSSAP_NOT_AVAILABLE (0XC00D11A3) with a message that says you need the latest Windows service pack. Even on Windows 10 or 11, this pops up. It means WMP can't find the Microsoft Secure Audio Path (MSSAP) — a component that handles DRM-protected content.

The fix: update Windows and reinstall the codec pack

1. Run Windows Update fully. Go to Settings > Update & Security > Windows Update and check for updates. Install all pending updates (yes, including optional ones). Reboot.
2. Reinstall the Windows Media Player codec pack. Download and run the Windows Media Player Codec Pack from Microsoft. Choose the default install. Reboot again.
3. Reset WMP settings. Open WMP, press Alt to show the menu, go to Tools > Options > Privacy tab and click Reset. Then go to the Player tab and click Reset.

That's it. Test the file. 9 out of 10 times this squashes the error.

Why this works

The error 0XC00D11A3 literally means the MSSAP (Microsoft Secure Audio Path) isn't available. That's a system-level component that decrypts protected audio streams. Windows updates often include DRM stack updates. The codec pack re-registers the necessary filters and DLLs that WMP depends on. If you haven't updated in a while, MSSAP might be missing or corrupted.

Less common variations and deeper fixes

1. Corrupted DRM system

If the basic fix didn't cut it, the DRM data might be fried. Delete the DRM folder inside %ProgramData%\Microsoft\Windows\DRM. This forces WMP to rebuild it on next launch. Steps:

1. Open Run (Win+R) and type %programdata%.
2. Go to Microsoft\Windows\DRM.
3. Delete everything inside (not the folder itself).
4. Reboot and try playing the file again.

2. Missing Media Foundation components

On some Windows 10/11 builds, Media Foundation gets stripped by third-party cleanup tools. Run this in an elevated Command Prompt:

DISM /Online /Cleanup-Image /RestoreHealth
sfc /scannow

Then reboot. This restores system files including MSSAP-related ones.

3. Third-party audio filters conflicting

If you have K-Lite or Shark007 codec packs installed, they can override WMP's secure path. Uninstall them entirely, then reinstall the official Microsoft codec pack from the link above.

Prevention tips

• Keep Windows Updated. Set updates to auto-install. Delaying them causes DRM and audio path versions to drift.
• Don't delete DRM folders manually unless you're troubleshooting — that's a last resort.
• Stick with official codec packs. The Microsoft pack is the only one guaranteed not to break MSSAP.
• Run DISM and SFC monthly if you're a power user. Keeps system files clean.

And that's all you need. The error NS_E_WMP_MSSAP_NOT_AVAILABLE is annoying but usually shallow — a few updates and a codec reinstall gets you back to watching your stuff. If it still persists after all this, you might be dealing with a custom WMP skin or a third-party app that intercepts audio — but that's rare. Good luck!