char[4]: "HM3W"
int: unknown
string: map name
int: map flags
0x0001: if 1=hide minimap in preview screens
0x0002: if 1=modify ally priorities
0x0004: if 1=melee map
0x0008: if 1=playable map size was large and has never been reduced to medium
0x0010: if 1=masked area are partially visible
0x0020: if 1=fixed player setting for custom forces
0x0040: if 1=use custom forces
0x0080: if 1=use custom techtree
0x0100: if 1=use custom abilities
0x0200: if 1=use custom upgrades
0x0400: if 1=map properties menu opened at least once since map creation
0x0800: if 1=show water waves on cliff shores
0x1000: if 1=show water waves on rolling shores
int: max number of players