.H3M File Extension
File TypeHeroes 3 Map File
What is an H3M file?
Map file for the turn-based strategy game, "Heroes of Might and Magic 3" (also known as "Heroes 3" or "HOMM3"); includes terrain information and the location of objects and characters on the map.
H3M files are referenced by the Heroes 3 game and can be created and edited using the Heroes 3 Map Editor (h3maped.exe).