Pointer to dynamic memory that contains information about fog of war.
There is 4 byte info for every tile of map, so the array is width*height*4 bytes long.
The one tile info struct:
0x00 Visibility (one bit per player (for 8 players only)
0x01 discovered (one bit per player)
0x02 Unknown
0x03 Unknown
(added by kovarex)