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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
RA - Extension Details
Date Added: January 01, 1970
File Extension:  .RA
Description 1: Real Audio files carry the file extension .RA. RealPlayer creates these audio files. The files often reference streaming audio files on the Internet, but they could also contain some audio data. .RA files make use of proprietary Real compression algorithms, a common format employed for playing audio clips within web browsers.
File Type:   Audio file
Mode: Binary
Program(s) to Open:  Mac, Windows and Unix: Web browser with RealPlayer Plugin, RealNetworks RealPlayer
Common:
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