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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
ZRF - Extension Details
Date Added: May 03, 2009
File Extension:  .ZRF
Description 1: The file extension .ZRF is associated with the Zillions of Games Zillions Rules File. Zillions of Games refers to a game package for use in Windows. It utilizes a completely distinctive universal gaming engine technology. With this technology, users can play practically any kind of abstract board game or puzzle out there.
File Type:   Game file
Mode: Binary
Program(s) to Open:  Open with Zillions of Games Zillions Rules File program
Common:
Extension: