.MPEG1 File Extension
What is an MPEG1 file?
Video file compressed using the MPEG-1 codec; may include both audio and video, though the audio track may use a separate type of compression; can be opened and played back by most media players.
NOTE: Some MPEG1 files may incorporate MPEG-2 compression isntead of MPEG-1. These files can be played back by most media players as well.