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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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USFLIB - Extension Details
Date Added: February 01, 2009
File Extension:  .USFLIB
Description 1: The .USFLIB extension is linked with Nintendo 64 Song Library. It contains a library of Nintendo 64 song files (.MINUSF) and includes a list of music that came from a game of Nintendo 64. In order for files to load properly, the .USFLIB files need to be in the same directory the miniUSF song files are in.
File Type:   Audio file
Mode: Binary
Program(s) to Open:  Windows: Nullsoft Winamp with 64th Note plugin
Common:
Extension: