Bebop, I am not sure but I believe there is a winzip for pc and a winzip for mac. The way to find out is to go to winzip.com and find out if it is downloadable in both formats. I think it is. If so, that would mean that mac winzip, zips it up in mac format. Therefore a pc would not be able to do it. But I am not positive. But I can offer a solution. If someone who has a mac wants to send you a song, I am sure they know someone who has a pc. Who doesn't now-a-days. So they can zip and send it from there. It is not a great solution, but it is one that will work. Maybe someone else will reply with a better answer but in case not, I thought i would offer mine.
Tony