Hi all,

I've Googled and searched the WiX mailing list, but I haven't been able to
figure this one out yet.

One of the biggest problems I've always had with MSIs is that they rarely
return useful error messages. I'm using a custom bootstrapper and I'd like
to display a custom error message if one of my deferred CA's fail.

Since deferred CA's are pretty limited, I don't know how to pass an error
value or message back to the installer from the CA that I can then use to
display the proper error UI.

What's the suggested approach? (I hope there's something better than
setting a registry value.)

Cheers,
Soren
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