I was able to figure out when the MBA Host loaded .NET 4.5.2 on Win7 RTM
using the .NET 4 hosting APIs and checking the registry. I have a proof of
concept in this branch: https://github.com/rseanhall/wix3/tree/bug4416.
The question is: what should the MBA Host do? Show a simple message box,
add a new page to the MBA prereq BA, fail silently, something else?
Apparently everything works fine if the bundle is run elevated, or Win7 is
32-bit. Should the MBA Host just let the bundle run in those situations?
I have a feeling that if the elevation was done by the application manifest
instead of the 'runas' verb, it would work fine. Maybe the long term
solution is to somehow move the elevation from ShellExecuteEx to the
manifest?
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