Finder making ZIP file password protected on Windows

Here's an odd one. Someone (on OS X.5.7) makes an archive (ZIP) of a folder and gives the same file to two people, one on XP and one on Leopard (10.5.8).
The Leopard user can open the zip file no problem. The XP user has a password prompt, and can't extract or copy the files out of the ZIP file without the password. But no password was set and nobody can guess what the password might be.
Anybody see anything like this while making ZIPs from Leopard?

I am having the same problem, occasionally and randomly.
It seems to be problem with XP and not Vista.
The standard advice is to right click the zip in Windows, then properties, then "unblock", but this doesn't work in the case of my most recent problem zip.
I have tried zipping todays problem folder with Finder, FileChute and Betterzip, and none of them will open in XP, but all will in Vista.
Note that XP will open the zip and show the jpegs, but the jpegs will not open.
Really would appreciate some help on this.

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Finder making ZIP file password protected on Windows

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