.GCM File Extension

A GCM file contains a Nintendo GameCube game ROM. It stores the exact contents dumped from a GameCube disc, which a gamer loads in a GameCube emulator, such as Dolphin or GCEmu, on a computer to play the game.

Gaming enthusiasts utilize emulation software to play games on their computers without the gaming console that originally played them. Gamers have developed emulators for various gaming consoles, including Atari, Nintendo, and Sega.

In the case of GCM files, GameCube gamers dump data from GameCube discs with special software and save it in the GCM format on their computer. Then, they play the game saved in the GCM file with an emulator on their computer or may upload the GCM file to make it available to other gamers looking to download and play the game.

You can open a GCM file with various GameCube emulators, including Dolphin and Dolwin, and GCEmu. For example, to open a GCM file with Dolphin, select File → Open....