.MP4A File

The mp4a file extension most likely best known for its use for one of the default file suffixes for the MP4A MPEG-4 audio codec.

The typical mp4a file contains audio, but mp4a is not native file extension for MPEG-4 audio files.

Native file extension is m4a (used by Apple) or mp4. When you rename .mp4a to either m4a or mp4, audio file will be playable in the most of media players.

How to open:

Any media player that can playable MP4 should be able to playback this file as well. You may need to rename the extension thought.

How to convert:

As this file only holds audio data, it can be converted to other audio formats.