File with an .XMB extension contains the Age of Empires or Age of Mythology games’ data stored in a text format based on XML. Files contain information on sounds, level or other data specific to a given scenario.

Age of Empires series are real-time strategy games. In Windows system they hold data in the

C:/Program Files/Microsoft Games/GAME_NAME/Data directory. File extensions are often composed in this way: file_name.xml.xmb.