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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
GCM - Extension Details
Date Added: January 01, 1970
File Extension:  .GCM
Description 1: .GCM file extension is linked with GameCube Image File. This is the file extension utilized by GameCube image file which usually requires an emulator in order for it to run on a computer. GameCube is the fourth home video game console developed by Nintendo. It was the first system that uses optical discs instead of game cartridges. .GCM file extension and GameCube are owned and developed by Nintendo.
File Type:   Game File
Mode: Binary
Program(s) to Open:  utilized by Nintendo GameCube game console
Common:
Extension: