.MGX File Extension
File Type 1Rise of Nations Saved Game
What is an MGX file?
Game saved in Rise of Nations, a real-time strategy game developed by Big Huge Games and published by Microsoft; saves game progress and can be opened within the program.
File Type 2Age of Empires 2 Expansion Replay File
.MGX File Association 2
Recording of a game from Age of Empires II with The Conquerors expansion pack; saves a complete recording of a campaign played by the user; can be played back within the Age of Empires II program.
MGX files should be stored in the "Age of Empires IISaveGame" folder in order to be loaded by the program.