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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
AA - Extension Details
Date Added: January 11, 2008
File Extension:  .AA
Description 1: .AA file extension is linked with Unix File. This file fixes syntax or loop errors in the UNIX system. UNIX is an operating system which is widelyused by workstations and servers. UNIX provided the key elements [environment and clientserver program model] in developing the Internet and in restructuring computing that is geared towards networking.
Description 2: .AA file extension is linked with Generic CD Image disc image created by disc imaging application/s. AA files also store an exact duplicate of a hard disk or other media type. AA files are basically ISO files that bear a different extension. The standard format of AA file is supported by various programs. This file can also be opened directly. .AA file extension is associated with ISOBuster from Smart Projects.
Description 3: .AA file extension is linked with digital audio books. Audible uses the same file format to store audio books. .AA is designed to store spoken word audios and supports bookmarks, chapter markers and others. Audible files are supported by Creative Zen, Apple iPod, SanDisk Sansa, and numerous GPS devices. .AA files are convertible into .MP3 format to allow other programs such as TuneCab and Tunebite to use it.
Description 4: .AA file extension is linked with Automated Analyst Document File. This is the file extension utilized by this document file. .AA file extension is associated with PROGNOSIS, which is a performance monitoring application developed by Integrated Research Limited. PROGNOSIS offers users with the following features: VoIP and IP telephony; web applications; POS/ATM; IT infrastructure; extended solutions.
File Type:   Document File
Mode: Binary
Program(s) to Open:  Windows & Mac: PROGNOSIS
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