I'm trying to use a 3rd party PHP script that provides some ClickBank hacker
protection, in connection with a commercial eBook which customers download
from my shared hosting 'NIX web server.

Latest Opera and Firefox work fine downloading my WinZIP 9 ZIP file,
containing my PDF eBook. But MSIE 6.0.2900.2180 downloads the php file itself
instead (don't know how this works, think the PHP is a wrapper around the
ZIP). The script vendor is having trouble solving this because he can't
replicate it on other machines, but it happens on both WinXP-SP2 systems here
on my home office LAN.

Have tried disabling all scumware protections, anti-viruses, etc. and also
disabling some processes. No joy.

Any ideas?
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-jc