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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
PAT - Extension Details
Date Added: September 09, 2008
File Extension:  .PAT
Description 1: .PAT is the extension associated with a pattern file. The bitmap image that is used as pattern allows for importing into several multiple graphics application programs. A .PAT file resembles a typical square file that can be 256x256 pixels or 8x8 pixels in size. It repeats to completely fill a particular area within a pattern. You often see this file format used in creating textured backgrounds.
File Type:   Image file
Mode: Binary
Program(s) to Open:  Windows: Adobe Photoshop, ACD Systems Canvas, CorelDRAW, Corel Paint Shop Pro Macintosh: Adobe Photoshop, ACD Systems Canvas
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