Mac zip file on PC

I have a problem when I send a mac zipped file to a PC user and they try to unzip the file
they are asked for a password. I didn't put password protection on the file and the PC user (XP) says they can unzip other files ok. Any ideas would be appreciated.

I have this problem, randomly and occasionally...ie it happens rarely and when it does I can find no difference between a successful zip and "password" zip.
It is not to do with e mailing. For example today I made a zip of six jpegs. I dragged it into my XP in Parallels and XP wanted a password. I then made a zip of six different jpegs in the same directory and dragged it into XP and it unzipped fine!!
I did the exercise because I had sent the bad one to a customer via Filechute and he complained he was being asked for a password, which is exactly what I found when I tried it my XP Parallels.
I have done "get info" on the files in the good and bad one and can see absolutely no differences.
I have tried zipping the bad ones with Finder, Filechute and Betterzip with the same result.
The bad one will open OK in Vista but not XP.
I use Filechute a lot to send jpegs to customers and this only happens about 1 in 50 times, for no apparent reason.
Really baffling!
Would love some help on this
Thanks

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