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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
USF - Extension Details
Date Added: January 01, 1970
File Extension:  .USF
Description 1: A .USF file extension is linked to the music format that Nintendo 64 or N64 games use. The main function of .USF files is to store the soundtrack of N64 videogames. These files sometimes also include an SR64 ROM image along with the recent saved state. USF files are ordinarily saved in sets that include a single .USFLIB file and several .MINIUSF files.
File Type:   Audio file
Mode: Binary
Program(s) to Open:  Windows: Nullsoft Winamp with 64th Note plugin
Common:
Extension: