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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
YKEY - Extension Details
Date Added: May 03, 2009
File Extension:  .YKEY
Description 1: .YKEY is the extension linked to the Castles & Catapults Game File. The Castles & Catapults game puts together a board games turnbased strategy and planning with the action associated with a realtime computer game. To get to the Atari website, just click on the official game site. Infogrames is the major owner of most of the Atari shares.
File Type:   Game file
Mode: Binary
Program(s) to Open:  Open with Castles & Catapults Game File program
Common:
Extension: