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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
RL2 - Extension Details
Date Added: January 01, 1970
File Extension:  .RL2
Description 1: File extension .RL2 is tied to the Nokia ST (Star Torrent) mobile phones series picture image. Associated with the Nokia PC Suite application, it is the extension that is considered similar to the .JPG format. The Nokia PC Suite is a Windowsbased PC applications package developed specifically for Nokia phones use. Depending on a persons phone model, the Nokia PC Suite allows its user to synchronize, edit and back up many of the phones files on a compatible computer via wireless or cable connection.
File Type:   Bitmap Image file
Mode: Binary
Program(s) to Open:  Associated application: Nokia PC Suite from Nokia Corporation
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