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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
B4S - Extension Details
Date Added: February 10, 2008
File Extension:  .B4S
Description 1: .B4S file extension is linked with Natively Winamp 3 + playlist. It is the playlist utilized by Winamp version 3. Version 5 of Winamp does not support this type of playlist format. .B4S file extension is associated with Wasabi which was the former name of Winamp 3. Wasabi.player is an opensource counterpart of Nullsoft Winamp.
File Type:   Document File
Mode: Binary
Program(s) to Open:  Windows: Winamp 3 or Wasabi.player
Common:
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