I'm curious why you'd want this over using a GUI library that is actually cross-platform? The way you've worded things suggests to me that you're building something new.
Because, as they always say, Win32 is the only stable ABI on Linux.
Perhaps a Windows-only RAD framework? (Admittedly, I can only think of VB6...)
I want to go back to making desktop programs the way we used to before they turned into web apps that bundled chrome. I know I should just use Qt but I have some experience already with win32, and all the programs I have fond memories of are written with it (foobar2000, winamp, Everything, etc).