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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
M4P - Extension Details
Date Added: January 01, 1970
File Extension:  .M4P
Description 1: .M4P file extension is linked with iTunes Music Store Audio file. It is under the Digital Rights Management owned by Apple and it is a proprietary version of MP4 .AAC, and it is particularly used when downloading music from iTunes Music Store. .M4P incorporates "Fairplay" DRM copy protection of Apple Computer which limits the number of computers that the file can be played on.
File Type:   Audio/Music File
Mode: Binary
Program(s) to Open:  Windows & Mac: Apple iTunes or QuickTime Player
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