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The File Extension Library

What is a file extension?

Short answer: it's the set of letters after the period (.) in the name of a file.

Long answer: File extensions signify the file format of a file. It tells the operating system (OS) how data was stored in the file. Not all OS, require a file extension though. For instance, this is optional in Unix, but is mandatory with MS-DOS and Windows systems.

In most file formats the file type is actually defined by the contents (first bytes, file structure), but extensions are used to define the application that is used for opening the file.

Below is a detailed database of thousands of file extensions our team has compiled for you. Feel free to browse!


Browse all Extensions:
ABCDEFGHIJKLMNOPQRSTUVWXYZ
M4A - Extension Details
Date Added: January 01, 1970
File Extension:  .M4A
Description 1: .M4A file extension is linked with MPEG4 compressed audio file. An M4A file uses similar compression as its .MP4 video file counterpart, minus the video track. MPEG4 audio files such as Apple iTunes Music Store products that usually includes copyright protection and comes with .M4P file extension. .M4A file extension is associated with several applications such as Apple iTunes, Windows Media Player, Apple Quicktime, NERO and Awave Studio.
File Type:   Audio/Music File
Mode: Binary
Program(s) to Open:  Windows: Apple iTunes or QuickTime Player, KSP Sound Player, Microsoft Windows Media Player, NCH Swift Sound WavePad, Other music players; Mac: Apple iTunes or QuickTime Player, Microsoft Windows Media Player, Other music players, Roxio Toast
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