Will there be any consequences of removing units from the Civ4UnitInfos.XML? Basically, I'm trying to delete units so I can enjoy a WWII scenario for myself. In order to do so, I'm trying to delete modern units from the game. If I do so, will the game crash or no? I am aware that I can set a unit's cost to -1 and prevent them from being built except that if I go that route older units can be upgraded to a unit I had set to -1. Lets say I removed mechanized infantry by setting its cost to -1. It prevents them from being built but then you could just make an infantry and upgrade it to a mechanized infantry. Any suggestions?