I was planning on just creating a separate package for the msu as indicated
here:
http://wixtoolset.org/documentation/manual/v3/bundle/authoring_bundle_package_manifest.html
<http://wixtoolset.org/documentation/manual/v3/bundle/authoring_bundle_package_manifest.html>
  

There are separate hotfixes for each version of Windows.  The package would
conditional reference the appropriate hotfix for each version of Windows.

The part I really need help with is how do I programmatically determine if a
hotfix is already installed?  Can I grep the registry for some the hotfix
number? That seems rather implementation specific and I'd hate for that to
change out underneath me.  Can I query the add/remove programs easily?



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