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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
YAR - Extension Details
Date Added: January 01, 1970
File Extension:  .YAR
Description 1: File extension .YAR is associated with the Castles & Catapults Game File. Castles & Catapults is able to combine the action of realtime computer games with the turnbased planning and strategy of a typical board game. To go to the Atari website, simply click on the official game site and the user will be redirected to Atari. Majority of Ataris shares are owned by Infogrames.
File Type:   Game file
Mode: Binary
Program(s) to Open:  Associated applications: Castles & Catapults Game File
Common:
Extension: