.W3M File Extension
Warcraft 3 Map File
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What is a W3M file?
A W3M file is a game map used by Warcraft III: Reign of Chaos. It includes terrain, objects, and resources placed within the map. W3M files are included with the game and can be created by players with the Warcraft III World Editor.
Maps for the Warcraft III expansion pack use the .W3X extension.