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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
RGBA - Extension Details
Date Added: January 01, 1970
File Extension:  .RGBA
Description 1: .RGBA is an extension tied to the Silicon Graphics Image (SGI) file format. This SGI file format is a bitmap originally used for images created or generated on Silicon Graphics machines. The .RGBA format allows for both uncompressed and compressed (using runlength encoding system) images in color and monochrome, with the added option of alpha transparency.
File Type:   Bitmap Image file
Mode: Binary
Program(s) to Open:  Associated application: SGI from developer/company SGI
Common:
Extension: