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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
RAS - Extension Details
Date Added: March 11, 2008
File Extension:  .RAS
Description 1: A .RAS extension is linked to the Raster image format that Sun Microsystems computers use. This type of file is normally created on Unix workstations. It provides support for 1, 8, 24 as well as 32 bits per pixel. RLE compression allows users to compress or uncompress .RAS files. Majority of image viewing application programs are able to recognize files with the .RAS extension.
File Type:   Raster Image file
Mode: Binary
Program(s) to Open:  Windows: ACDSee Photo Manager, C Point Photo Magic, Corel Paint Shop Pro, FMJSoftware Image Eye, The GIMP, XnView Macintosh: Lemke Software GraphicConverter, The GIMP, XnView Unix: Sun Microsystems software, The GIMP
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