I've done some tests, more than one year ago starting from this webinar, without particular difficulties setting up the environment and building a sample app for Win32.
What I'd like to understand is that, more than what is documented on the API reference list there's any particular difference between this target and the usual ones that was "surprising|.
I'm talking about sometimes little things that are not supported, like the splash screen;
Yep, is it very difficult to implement a splash screen?
Another thing I found "surprising" is that the toolbar isn't shown in builds at Rhohub. Same does show in local builds, though I haven't been able to generate a setup installation executable locally.