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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
ZD2 - Extension Details
Date Added: May 03, 2009
File Extension:  .ZD2
Description 1: File extension .ZD2 is associated with the Zillions of Games Zillions Locked rules File. Zillions of Games is a Windows game package utilizing a totally unique universal gaming engine technology. Such technology lets users play almost any kind of abstract board game or puzzle on the planet. In general, the .ZD2 file format is just used with the demo.
File Type:   Game file
Mode: Binary
Program(s) to Open:  Open with Zillions of Games Zillions Locked Rules File program
Common:
Extension: