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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:
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UMX - Extension Details
Date Added: February 01, 2009
File Extension:  .UMX
Description 1: .UMX is the extension tied to the Unreal Music Package file. It has music files inside that are tapped for background music within the different levels of the Unreal Tournament. The UMX files feature eight or 16bits, stereo, mono sound. Computer games get good use out of such files, specifically those tapping the Unreal game engine. Epic is the developer behind the UMX file format.
File Type:   Game file
Mode: Binary
Program(s) to Open:  Windows: Epic Games UnrealEd
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