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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
RAX - Extension Details
Date Added: January 01, 1970
File Extension:  .RAX
Description 1: File extension .RAX refers to a RealMedia streaming file. It is the latest RealAudio format version used for both downloading and streaming. RealAudio 10 makes use of the same highcompression codecs as previous RealAudio versions at low bit rates, switching to AAC at above 128 kbps to make room for better compatibility and fidelity with various players that are AACenabled.
File Type:   Movie, video, multimedia file
Mode: Binary
Program(s) to Open:  Use RealPlayer
Common:
Extension: