.M1A File Extension
What is an M1A file?
Audio file encoded using MPEG-1 Layer II compression; contains only compressed audio data, but may be saved along with a corresponding .M1V video file; also known as an Apple MPEG-1/1 Audio file.
The MPEG-1 format is supported by Apple QuickTime Player and other media players. It has been mostly placed by the .MP3 compressed audio format.