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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
USX - Extension Details
Date Added: January 01, 1970
File Extension:  .USX
Description 1: USX is a file extension that has to do with 3D models utilized for the creation of arenas for games from Unreal. For these files, the model shape remains static. However, it is possible for the size and orientation to change. Creating and editing USX files is done with the help of the Unreal level editor known as "UnrealEd.
File Type:   Game file
Mode: Binary
Program(s) to Open:  Windows: Epic Games UnrealEd
Common:
Extension: