I never installed Civ 4 in program files, but I did have the event interface file in the correct place. I copied yours over and replaced mine, just to be safe, but that didn't work either. I supose I can just re-install civ 4 and see what happens then. This is pretty unusual, I have the right file in what I presume to be the right place, but it simply won't load and only on your mod.