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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
X - Extension Details
Date Added: January 01, 1970
File Extension:  .X
Description 1: File extension .X is associated with the FPS Creator Model file. It is specifically attached to models the FPS Creator uses. The FPS Creator took three years to develop and it set a new benchmark in the games creation market scene by offering an extremely flexible editing environment that is also easytouse. It is a tool used to create actionpacked FPS games with no 3D modeling or programming knowledge required (hence, its name).
File Type:   3D Graphics, CADCAM file
Mode: Binary
Program(s) to Open:  Associated application: FPS Creator from The GameCreators
Common:
Extension: