"Could not find mime type application/octet-stream"

Hi. I seem to have messed up the file associations list. I went into Trinity Control Center to add .webm as a video file type, and somehow deleted something so that now I'm getting "Could not find mime type application/octet-stream" errors every time I drop a file onto the desktop. Maybe I could recreate the entry, or copy the default file associations list back over my user .trinity list? I don't want to have to reinstall everything just to clear a "Sorry" pop-up. Curt- -- The secret of happiness is freedom, and the secret of freedom is courage. - Thucydides