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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
AB3 - Extension Details
Date Added: January 01, 1970
File Extension:  .AB3
Description 1: .AB3 file extension is linked with PhotoImpact 3 Album File a third version of the Unlead PhotoImpact application that is used for cataloging and organizing pictures and images. This file contains references to the user's album images but not the images [image files] themselves. PhotoImpact 3 offers users fast and easy fix mode, nextgeneration cropping, smartguide help, power retouch capabilities, RAW file support, smartremove scene compositor and high dynamic range. .AB3 and PhotoImpact 3 are owned and developed by Unlead.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: Unlead PhotoIMpact 3 or later
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