.W3X File Extension

Game map or scenario created for Warcraft III: The Frozen Throne expansion pack; includes terrain information, regions, units, and other objects that can be placed within the map; may be included with the game or created by players using the Warcraft III World Editor.

W3X files are popularly used for the Defense of the Ancients (DotA) Allstars modification, which is a custom map that has been calibrated for competitive gameplay using custom heroes.

Standard Warcraft III maps use the .W3M extension.