Gaming · Windows
How to Fix Roblox 'Failed to Load Library' Errors
Source-checked About 10 minutes
Answer
Reinstall Roblox first. If the failed-library message remains, repair Windows with DISM and System File Checker; on Windows N or KN, also install Media Feature Pack.
Record the missing library name
Copy the complete Failed to load library message, including the DLL name. Roblox identifies this as a local Windows-file, security-software, update, or installation problem.
Reinstall Roblox
Uninstall Roblox, remove the old %localappdata%\Roblox folder, and install the official desktop or Microsoft Store version again. Test before continuing.
Repair Windows system files
Open Windows Terminal as administrator, run DISM /Online /Cleanup-Image /RestoreHealth, then run sfc /scannow. Restart Windows after both commands finish.
Install Media Feature Pack on N or KN editions
Only on a Windows N or KN edition, open Settings > Apps > Optional features, add Media Feature Pack, and restart. This addresses missing media libraries such as MFPlat.dll.
Check security quarantine and updates
Check whether the security app quarantined a Roblox file, and follow that product’s official instructions before restoring anything. Install available Windows and graphics-driver updates from their official sources.
Contact Roblox Support
If the error remains, send Roblox Support the exact message and DLL name, the Windows edition and version, and the troubleshooting steps already completed.
Video walkthrough
If it does not work
- Do not download an individual DLL from a repair site. If Roblox Support needs a report, include the exact DLL name shown in the error.
Sources and verification
Checked against official documentation on . Scope: Windows.
Follow the linked first-party guidance if labels differ after a platform or app update.