How can I permanetly delete (remove) a thumbmail associated with a mp3 file? I store the song on my second hard drive. The media player and Windows is on another drive. I go in the folder (view hidden folders) delete the images. Then I go to C/users/me/Appdata/Local/Microsoft/Media Player/Art Cache/LocalMLS and delete it there. Clear trash. But when I open the media player library it returns.