1.Are there some good object-oriented frameworks/libraries for doing Windows GUI development as easily as with C# and .Net (but producing native code ofcourse)? If yes, does it also support targeting 64bit x86 "x64" windows with little code change?

The fact that C funcs can be called ofcourse gives one access to win api, but it ain't a very confortable way of doing things...

(I will now post some very different questions that might be interpreted as me not knowing what I want, but I want to know about all of them;)