Or better yet, just use the upgrade logic in the Windows Installer... unless of
course you're trying to detect a non-Windows Installer package. In that case,
then you really should use the mechanism the previous product suggests to
detect it. If it is really to go walk around in the ARP
I would like to use the Windows registry (and not the file system) to
detect if a package is already installed.
I was thinking of using something like this, but can't seem to get it to
work. I most likely have the logic wrong in CDATA.
Property Id=PACKAGE_INSTALLED
RegistrySearch
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