Suppose I'm going to add simple Windows gui for an app today, what should I use out of > 5 year old technologies? WinAPI in classic way, using Petzold's "Programming Windows, 4th edition" as a guidebook? WinAPI wouldn't be enough, I suppose, so can I use at least Comctl32 or is it deprecated? Should I use MFC? ATL? COM? Or should I use WinForms with .NET? Even if my app is written in native code? Isn't it for "business apps" only? Can I use it to write another Winamp?

I'd probably choose Qt.