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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
ALF - Extension Details
Date Added: July 03, 2009
File Extension:  .ALF
Description 1: .ALF file extension is linked with AbacusLaw Data File. This is the file extension utilized by AbacusLaw a fullfeatured case management, calendaring, conflict checking, messaging and many others. This application allows users to enjoy these full benefits minus the fuss, accounting and billing concerns. AbacusLaw is owned and developed by Abacus Data Systems Inc.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows & Mac: AbacusLaw
Common:
Extension: