If zipping a file caused any kind of corruption, the game would never have returned to normal. Most of the time if there's corruption during the zipping process, the file won't unzip, but give you an error message.
Zipped files do not lose data like JPG images do. If you zip a file, then upzip it, the new file will be identical to the one you originally zipped. If there was any problem with the file, it was there before you zipped it.
If the zip file was corrupted in transit, it wouldn't unzip. The best you could hope for is to get a message telling you the file is corrupt and the zip utility will attempt to fix it. I'm not sure if WinRAR does this, but I've seen it in other zip programs in the past.
Hook