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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
RAST - Extension Details
Date Added: January 01, 1970
File Extension:  .RAST
Description 1: The .RAST extension is tied with the Sun Raster format. This is the native bitmap format found on Sun Unix platforms. .RAST files bear a simple bitmap file format that enjoys wide distribution, specifically in the world of Unix systems. RAS is the default extension associated with Sun Raster files.
File Type:   Bitmap Image file
Mode: Binary
Program(s) to Open:  Associated application: awardwinning editor and converter for Windows and OS/2 platforms PMView Pro from Blueprint Software Works
Common:
Extension: