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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
Q4Q - Extension Details
Date Added: December 03, 2009
File Extension:  .Q4Q
Description 1: File extension .Q4Q is associated with the Solar Cell Photoshop Plugin. It refers to a Photoshop plugin that Flaming Pear Software developed. This type of file is used to create stars and suns with effects that can be customized. For .Q4Q files to work, they need to be stored in the Plugin folder located under the application folder.
File Type:   Plugin file
Mode: ASCII
Program(s) to Open:  Windows: Adobe Photoshop or Corel Paint Shop Pro Macintosh: Adobe Photoshop
Common:
Extension: