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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
M4B - Extension Details
Date Added: March 01, 2009
File Extension:  .M4B
Description 1: .M4B file extension is linked with Myst IV: Revelation Game archive. This is the archive file format utilized by Myst IV: Revelation an aweinspiring, visual 3D computer game series. Myst IV: Revelation is the fourth in the Myst game series that follows the tale of two villainous characters, Sirrus and Achenar, who were first introduced in the initial Myst game. .M4B file extension and Myst IV: Revelation are owned and developed by Ubisoft Entertainment.
Description 2: .M4B file extension is linked with MPEG4 Audio Book File. This is the audiobook file based on MPEG4 container file format. It is usually compressed with .AAC encoding. .M4B is similar to .M4A, but it can be bookmarked and it is signified as an audiobook by supporting audio/music players. .M4B file extension is utilized by audiobooks that are downloaded from Apple iTunes store.
File Type:   Audio & Music File
Mode: Binary
Program(s) to Open:  Window & Mac: Apple iTunes + iPod, Microsoft Windows Media Player, VideoLAN VLC Media Player; Unix: VideoLAN VLC Media Player
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