Drewster

I have 2 questions, 1 is, what files do i need to transfer if i want to transfer my cities and regions from a computer to another, i have the regions file transfered but no cities appear, also, a real big Newbie question, how do i get skyscrapers to appear, i finally have a couple of pretty tall looking ones coming in, but only about 2, what are the requirements to get skyscrapers to appear?