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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
YAP - Extension Details
Date Added: January 01, 1970
File Extension:  .YAP
Description 1: .YAP is the extension tied to Castles & Catapults Game File, the game combining a board games turnbased planning and strategy with the action of a realtime PC game. Click on the official game website to be redirected to the Atari site. The bulk of Atari shares are owned by Infogrames.
File Type:   Game file
Mode: Binary
Program(s) to Open:  Associated application: Castles & Catapults Game File
Common:
Extension: