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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
M3U - Extension Details
Date Added: July 09, 2008
File Extension:  .M3U
Description 1: M3U is short for MP3 URL. It includes an MP3s playlist along with other video and audio files. An M3U lists locations of media files in plain text format. First used by Winamp, M3U files are now utilized by more media players. Commonly used for audiotype playlists, M3U playlists sometimes also feature references to video files. Although they contain references to media files, the actual files are not present in M3U files.
File Type:   Audio file
Mode: Binary
Program(s) to Open:  Windows: Apple iTunes, RealNetworks RealPlayer, Nullsoft Winamp, Roxio Easy Media Creator, VLC media player Macintosh: RealNetworks RealPlayer, Apple iTunes, VLC media player Unix: XMMS, VLC media player
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