http://bugs.winehq.org/show_bug.cgi?id=20220
--- Comment #19 from Vincent Povirk madewokherd@gmail.com 2012-05-08 09:29:35 CDT --- Created attachment 40089 --> http://bugs.winehq.org/attachment.cgi?id=40089 test program
Looks like that won't be necessary. According to the results of this test program, the _Proxy functions and the normal COM way of doing things are interchangeable, and WICCreateImagingFactory_Proxy gives me an object with the same vtable as CoCreateInstance.
So I guess I'll just write them as thin wrappers.