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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
Q1Q - Extension Details
Date Added: December 10, 2008
File Extension:  .Q1Q
Description 1: The .Q1Q file extension is a photoshop plugin that Flaming Pear Software developed. Falling under the PageMaker 6.5 Document general filetype, its main use is for 3D planets creation. Q1Q files feature customizable texture, air, cloud and climate settings. This kind of file needs to be kept in the Plugins folder, inside the application folder, to work right.
File Type:   Plugin file
Mode: ASCII
Program(s) to Open:  Windows: Corel Paint Shop Pro or Adobe Photoshop Macintosh: Adobe Photoshop
Common:
Extension: