Civ IV had two expansions, but they were standalone. Some games require the base game but have a second .exe to run the expansion (e.g. Anno 1404 Venice requires 1404, but is otherwise standalone), some games add to the base game like DLC (e.g. Dredmor's expansions). All I want to know is whether it's a separate launcher (i.e. standalone) or whether it integrates like the DLC.