.GMA File

The gma file extension is most likely best known for its use for a special add-on file for Garry's Mod sandbox computer game.

The gma file contains modification of the game and may alter any kind of game files.

Files with gma file extension can be nowadays found as special add-ons for Garry's Mod sandbox computer game.

How to open:

When you place this file in the default addon-folder, the data will be automatically loaded in the game.

How to convert:

Possibly can be edited or converted using some kind of modding tools for Garry's mod.