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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
Q9S - Extension Details
Date Added: December 10, 2008
File Extension:  .Q9S
Description 1: The .Q9S extension is tied with the Mr. Contrast Photoshop plugin. It is a Photoshop plugin that was developed by the firm Flaming Pear Software. Use this plugin for adding dramatic contrasts to photos as well as hyperemphasized details. To avoid encountering problems when utilizing this plugin, make sure it resides in the Plugins folder inside the applications folder.
File Type:   Plugin file
Mode: ASCII
Program(s) to Open:  Windows: Corel Paint Shop Pro or Adobe Photoshop Macintosh: Adobe Photoshop
Common:
Extension: