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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
SD - Extension Details
Date Added: January 01, 1970
File Extension:  .SD
Description 1: .SD is the file extension that has links with audio files from Sound Designer. It has to do with the audio format that Sound Designer uses that comes in eight and 16bits of mono sound format. Sound Designer is responsible for releasing one of the very first programs that can be used to edit audio in Mac computers.
File Type:   Audio/Music file
Mode: Binary
Program(s) to Open:  Windows: FMJSoftware Awave Studio, Digidesign Pro Tools Macintosh: Pro Tools, Digidesign Sound Designer
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