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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
TOAST - Extension Details
Date Added: January 01, 1970
File Extension:  .TOAST
Description 1: .TOAST is the extension associated with Apple II files. CD and/or DVD disk images are created using Roxio Toast, a known disc authoring program for Mac computers. The images produced are similar to those bearing the standard .ISO disk image, only containing specific Toast formatting info. Switching the Toast disc image file extension from .TOAST to .ISO enables opening the files via Windows discauthoring applications and Apple Disk Utility software. The downside is that there is no guarantee of compatibility.
File Type:   Image file
Mode: Binary
Program(s) to Open:  Macintosh: Roxio Toast
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