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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
MAB - Extension Details
Date Added: January 11, 2008
File Extension:  .MAB
Description 1: .MAB file extension is linked with Mozilla Address Book File. .MAB files or address book files are situated in the users profile directory, particularly in the .SLT folder. Mozilla is an opensource internet web browser that is designed for standard compliance, portability and performance. Mozilla is the cousin of Netscape Communicator which is being developed by the free software community in cooperation and support of Netscape. The Mozilla Foundation supports all of Mozillas opensource software projects.
File Type:   Data File
Mode: ASCII
Program(s) to Open:  Windows & Mac: Netscape or Mozilla Web Browser
Common:
Extension: