Interesting. Windows should unpack the zip well. But okay, try to download 7zip and unpack it with that tool. When you right click the zip file 7zip should give you it's own options to unpack.
I was actually using 7zip already before, then I tried with the windows option itself and it worked, I mean, the first time it show an error and closed, but I opened it again and it worked normally. But thanks tho, if you didn't say that I'd probably not try to use the windows unzip option.
