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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
Q2Q - Extension Details
Date Added: December 10, 2008
File Extension:  .Q2Q
Description 1: .Q2Q is a file extension associated with a Flaming Pear Software Photoshop plugin. People use it to transform images into a variety of shapes while applying different lens effects. In order to work correctly, this Flexify Photoshop Pluginclassified file needs to reside in the Plugins folder found within the Photoshop application folder.
File Type:   Plugin file
Mode: ASCII
Program(s) to Open:  Windows: Corel Paint Shop Pro or Adobe Photoshop Macintosh: Adobe Photoshop
Common:
Extension: