To delete the files from the recent files list in Windows Media Player,there are two ways you can clear the list:
I. The ClearMRU.exe Utility is available for free in the Windows Media Player Bonus Pack from Microsoft, but Microsoft does not support this tool.
II. You can also manually delete the list through the Windows Registry:
1. Start the Windows Registry Editor, regedit.exe, by typing regedit in the Windows Run Command Line.
2. Go to HKEY_CURRENT_USER\Software\Microsoft\MediaPlayer\Player\RecentFileList.
3. Delete the RecentFileList subkey.
4. If you've also streamed content from the Internet, you can delete the RecentURLList subkey.
5. Exit the Registry Editor.
6. Restart the computer.
Now your recent list is deleted...