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ObjectTypes
ObjectTypes is a generic term that refers to the lists of various objects in the game that are listed in rules.ini. There are 4 main object lists to be concerned with and several lists that are less often looked at.
BuildingTypes are buildings in the game.
VehicleTypes are the vehicles (and in RA2 the naval units and some aircraft).
InfantryTypes are the infantry and animal units.
AircraftTypes are the true aircraft objects.