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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:
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GB - Extension Details
Date Added: May 01, 2009
File Extension:  .GB
Description 1: .GB file extension is linked with Game Boy ROM file. This is a readonly memory or ROM file that contains the Game Boy game data. This file also contains the exact copy of Nintendo Game Boy cartridge data. It can be played on either PC or Mac using the Game Boy emulation program. The standard .GB file is supported by various programs.
File Type:   Backup File
Mode: Binary
Program(s) to Open:  Windows: BGB, Basic Boy, KiGB, TGB Dual, Visual Boy Advanced; Mac: Boycott Advance, Visual Boy Advance
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