Hey, yea it is a weird problem..
i dunno why it happens but i believe i have a solution for you.
If you use winrar 3.20 or higher, when you "extract" the files
you'll see a a dialog box(or whatever you call it) with many options..
look for the "miscellaneous" part, and you'll see "Keep broken files" option. Check it. Uncompress the archive. And i hope that helps.
