[Bug 43146] gtkmm hello world program can't show window

https://bugs.winehq.org/show_bug.cgi?id=43146

--- Comment #7 from ben  ---
Created attachment 58375
  --> https://bugs.winehq.org/attachment.cgi?id=58375
terminal output

I've installed the 32-bit libraries, and now that error message about not
finding the 32-bit gtk3 library has gone away.

Now I'm stuck with a bunch of uxtheme-gtk.dll messages, and I'm not sure how to
disable that.