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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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UFO - Extension Details
Date Added: January 01, 1970
File Extension:  .UFO
Description 1: .UFO is the file extension identifying PhotoImpact Image files. The extension is related to Ulead Systems PhotoImpact graphics and image rendering application. Count the .UFO extension among the advanced extension types that often feature Uleadspecific instructions. Although largely identified with the Ulead PhotoImpact proprietary image format, .UFO is still recognized by other Ulead video and photo editing software, supporting multiple layers. It is much like the Photoshop documents .PSD extension.
File Type:   Image file
Mode: Binary
Program(s) to Open:  Windows: Ulead PhotoImpact, Movie Factory or VideoStudio
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