.GMX File Extension
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What is a GMX file?
Compressed project file created by YoYo Games GameMaker: Studio, a game development application; contains a game project; includes sounds, scripts, sprites, backgrounds, rooms, objects, fonts, shaders, and constants used to build the game.
To create a GMX file, select File → New Project, name the file, choose the save location, and click Save.
To open a GMX file, select File → Open Project..., navigate to your file, and click Open.
Programs that open or reference GMX files