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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
USZ - Extension Details
Date Added: December 03, 2009
File Extension:  .USZ
Description 1: File extension .USZ is linked to UsiXML (short for User Interface eXtensible Markup Language and read as "yousiksml) UI Description File. UsiXML refers to an XMLcompliant markup language describing the UI for multiple use contexts like Graphical User Interfaces (GUI), Multimodal User Interfaces, Character User Interfaces (CUI), and Auditory User Interfaces.
File Type:   Archive file
Mode: Binary
Program(s) to Open:  Open with UsiXML UI Description File program
Common:
Extension: