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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
AAC - Extension Details
Date Added: January 01, 1970
File Extension:  .AAC
Description 1: .AAC file extension is associated with the Advanced Audio Coding file a compressed standard audio format that is used for highdefinition audio samples. This audio format is widelyused by many audiorelated programs and music playback applications like Apple iTunes. .AAC is owned by Cucusoft, Inc. This file also offers high coding efficiency, better frequency handling and simple filterbank.
File Type:   Audio/Music File
Mode: Binary
Program(s) to Open:  Windows: Apple iTunes + iPod, KSP Sound Player, Mplayer, Media Player Classic, Roxio Easy Media Creator; Mac: Apple iTunes + iPod, Mplayer, Roxio Toast, VideoLAN VLC media player; Unix: Mplayer, VideoLAN VLC media player, XMMS with AAC plugin
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