REGEDIT4

[-HKEY_CLASSES_ROOT\.ogm]
[-HKEY_CLASSES_ROOT\ogmfile]

[-HKEY_CLASSES_ROOT\.mp4]
[-HKEY_CLASSES_ROOT\mp4file]

[-HKEY_CLASSES_ROOT\.mka]
[-HKEY_CLASSES_ROOT\.mkv]
[-HKEY_CLASSES_ROOT\MatroskaVideo]