What is a GMX file?
A .GMX file is primarily a GameMaker File created by YoYo Games. Developers use these files to store project assets, settings, and code for video games built in the GameMaker software. These files store data in the standard XML format. In some cases, a .GMX file can also be a recorded game replay from Age of Empires by Microsoft.
How to open GMX files?
You can open a standard .GMX project file using GameMaker. Because most of these files use plain XML text, you can also inspect them using simple text editors like Notepad++ or Visual Studio Code. If the file is an Age of Empires replay, you must load it within the game engine itself to watch the recorded match.
Software and tools
To manage or edit GameMaker assets, you need the official GameMaker development environment. For quick inspection or version control, developers often use standard command-line tools or code editors. Since a .GMX file can have different origins, viewer.online/gmx analyzes .GMX files to identify their exact format and creator software, shows which programs can open the file, and usually previews it.
Summary
Because .GMX files use the known XML format, viewer.online/gmx can safely open and display them online, eliminating compatibility problems. If you are unsure whether your file is a GameMaker File or a game replay, our tool will identify the actual format of your file immediately.