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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
ALIAS - Extension Details
Date Added: January 01, 1970
File Extension:  .ALIAS
Description 1: .ALIAS file extension is linked with Alias Image File. This is the file extension for bitmap graphics file [24bbit RGB RLE]. Alias Wavefront is a computer graphics company which is a merger between Silicon Graphics and Alias Research. Originally, it was Wavefront Technologies that started developing and selling animation software for Hollywood movies and other industries. Wavefront was bought by Silicon Graphics in 1995.
File Type:   Bitmap Image File
Mode: Binary
Program(s) to Open:  Windows & Mac: XnView
Common:
Extension: