http://bugs.winehq.org/show_bug.cgi?id=15796
--- Comment #4 from Vincent Povirk madewokherd@gmail.com 2010-08-03 12:28:01 --- Actually, the type is in Mono. I thought I searched for this before, but apparently not.
The IID is IManagedInstaller, also declared in Mono. So we just need to create an instance of this thing, and Mono should provide the COM interface we need. Also implement it, since it's just a stub.