Ah ha! This file works! It's just labeled wrong. The archive is actually a .rar encoded file. I found out when I got a good copy of a .zip and still hadn't deleted the 'broken' copy I found here. I compared the two with a hex editor and found out it was mislabeled. I've tested some of my other 'broken' downloads and they work too. If you come across a file that won't open, try changing the file extension to .rar to see if that helps. Pass on this info to others looking at different mislabeled files too.