I'm new around here, I just picked up Civilization III Gold Edition about a week ago- I have a question about the downloads around here.

Some of the downloads are fine after I get them, I can unzip them and everything. However, there are others, such as the Bismarck battleship, that after I download them, when I try to unzip them, I either get an error message that says "the file is corrupted", or my computer simply refuses to recognize the file. Does anyone know what is wrong?