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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
AB - Extension Details
Date Added: January 01, 1970
File Extension:  .AB
Description 1: .AB file extension is linked with Applix Builder File the project file developed using Applix Builder. .AB files are programming modules utilized by Applixware Linux development software. Applixware offers developers an array of applications such as spreadsheets, HTML author, graphics and words. .AB file extension and Applix Builder are owned and developed by Applix, Inc.
File Type:   Source Code and Script File
Mode: ASCII
Program(s) to Open:  Unix/Linux: Applix Builder
Common:
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