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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
USA - Extension Details
Date Added: January 01, 1970
File Extension:  .USA
Description 1: The .USA extension is associated with the Unreal Saved Game File. It refers to a game saved in the Unreal or Unreal 2 firstperson shooter games. .USA files save the progress of the players. The game can be loaded from the point when it was saved. Around nine games at a time can be saved on Unreal. Save files are assigned names ranging from "save0.usa to "save8.usa, and saved within the "UnrealSave folder. Quick saves are found stored in "save9.usa. Save files references are kept in the same directory, only under "User.ini file.
File Type:   Game file
Mode: Binary
Program(s) to Open:  Windows: Epic Games Unreal and Unreal II: The Awakening Macintosh: Epic Games Unreal
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