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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:
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YPCL - Extension Details
Date Added: May 03, 2009
File Extension:  .YPCL
Description 1: .YPCL is the extension associated with the Castles & Catapults Game File. Castles & Catapults puts together the action of a realtime PC game with the turnbased strategy and planning of a regular board game. Click on the official game website to get redirected to the Atari Internet site. The bulk of Ataris shares is owned by the firm Infogrames.
File Type:   Game file
Mode: Binary
Program(s) to Open:  Open with Castles & Catapults Game File program
Common:
Extension: