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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
XTREME - Extension Details
Date Added: January 01, 1970
File Extension:  .XTREME
Description 1: File extension .XTREME is associated with the Winstep Xtreme Theme Pack. It is a theme file format that the Windows desktop customization program called Winstep Xtreme uses. XTREME files contain one or several themes for application in modifying the Windows interface. These files are saved in compressed format that Winstep automatically expands upon opening.
File Type:   Settings file
Mode: Binary
Program(s) to Open:  Windows: Winstep Xtreme
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Extension: