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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
M4V - Extension Details
Date Added: January 01, 1970
File Extension:  .M4V
Description 1: Apple uses the multimedia container file format M4V for various videos downloaded from its iTunes store. It is a lot like the MP4 file except that M4V files feature Apples proprietary copyright management program software. Meaning, such files are protected by Apple FairPlay DRM copyright. MPEG4 files include TV episodes, fulllength films and music videos. The account used to purchase a particular video authorizes (via iTunes) users to play protected M4V files on their PCs. Other video players can recognize and play unprotected M4V files by switching file extensions from .M4V to MP4.
File Type:   Video File
Mode: Binary
Program(s) to Open:  Windows: Media Player Classic, RealNetworks RealPlayer, Apple iTunes, iPod or QuickTime Player, Miro Macintosh: RealNetworks RealPlayer, iPod, Apple iTunes or QuickTime Player, Miro Unix: Miro
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