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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
R - Extension Details
Date Added: January 01, 1970
File Extension:  .R
Description 1: .R file extensions identify audio files storing data for the correct or right audio channel of a particular audio track. You can play such files using a wide range of media or music players. Files bearing the .R extension are usually exported via audio production programs. Examples of such applications are the Cubase (for Mac and Windows) and the Digital Performer (for Macs).
File Type:   Audio file
Mode: Binary
Program(s) to Open:  Mac and Windows: Apple iTunes or other music players
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