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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
AL$ - Extension Details
Date Added: January 01, 1970
File Extension:  .AL$
Description 1: .AL$ file extension is linked with Midiprg Steinberg Cubase Compressed File. This is the file extension for the compressed file utilized by Steinberg Cubase a production software for composing, recording, editing and mixing music. Cubase 4 offers new enhanced features such as new plugins, enhanced userinterface and supreme VST instruments. Cubase is owned and developed by Steinberg Media Technologies GmbH.
File Type:   Audio and Music File
Mode: Binary
Program(s) to Open:  Windows & Mac: Steinberg Cubase
Common:
Extension: