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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
ARF - Extension Details
Date Added: August 03, 2009
File Extension:  .ARF
Description 1: .ARF file extension is linked with Flexible Image Transport System Bitmap. FITS or Flexible Image Transport System was initially developed in the late 1970s to allow astronomical image data exchange between different types of computers or varying lengths and means of expressing numerical values. The latest features of FITS has evolved to cater the sophisticated and more complex astronomical instruments and providing support for images, text tables, spectra, binary tables and data cubes, and others.
Description 2: .ARF file extension is linked with AIM [AOL Instant Messenger] Resource File. This is the file extension for the resource file utilized by AIM AOL. AIM or AOL Instant Messenger is a nonexclusive application which offers instant messaging to all internet users across the globe. It allows users to communicate privately, have personalized text messages and has a tool that tells whether user is online. AIM is owned and developed by AOL.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows & Mac: AIM
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