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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
G721 - Extension Details
Date Added: January 01, 1970
File Extension:  .G721
Description 1: .G721 file extension/audio file format contains Raw CCITT [International Telegraph and Telephone Consultative Committe]/ITU G.721 4bit ADPCM [Adaptive Differential PulseCode Modulation] sound format. .G721 is an ITU standard used for speech codec that utilize ADPCM methodology, providing high definition audio at 32 Kbps. .G721 is also associated with other applications such as Awave Studio from FMJ Software.
File Type:   Audio/Music File
Mode: Binary
Program(s) to Open:  Windows: Allok Audio Convertor, AudioKit, Complete Audio Converter Lite, Sprintbit Software File Audio Processor, libsndfile; Mac: libsndfile
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