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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
YMY - Extension Details
Date Added: May 03, 2009
File Extension:  .YMY
Description 1: .YMY is the file extension tied to Castles & Catapults Game File. In Castles & Catapults, the turnbased strategy and planning of typical board games is combined with the action of realtime computer games. To be redirected to the Atari website, simply click on the official game site. The large portion of Ataris shares is owned by Infogrames.
File Type:   Game file
Mode: Binary
Program(s) to Open:  Open with Castles & Catapults Game File program
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Extension: