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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
WM - Extension Details
Date Added: January 01, 1970
File Extension:  .WM
Description 1: .WM is the extension associated with Windows Media audio or video files. Such files may contain video, audio, or both. Formatting .WM files is done with the help of the Windows Media Player codec. Described as a simplified file extension, the .WM extension can either be .WMA for Windows Audio, or .WMV for Windows Video files. .WMA and .WMV, being more specific are utilized more often than the .WM file extension.
File Type:   Video file
Mode: Binary
Program(s) to Open:  Mac and Windows: Microsoft Windows Media Player
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