Actually the last few iterations of VS and Office skinning have gotten added into MFC and can be enabled pretty easily for any app. The Ribbon UI is also fully available in MFC and VS. Just no one uses any of this stuff for obvious reasons.
Spotify actually uses Qt but with a custom stylesheet that makes it look more like iTunes. I have no idea why they did this, I think it makes it look terrible and clunky. Read this for more info:
http://msdn.microsoft.com/en-us/library/vstudio/cc137831.asp...
http://msdn.microsoft.com/en-us/library/ee354408.aspx
Spotify actually uses Qt but with a custom stylesheet that makes it look more like iTunes. I have no idea why they did this, I think it makes it look terrible and clunky. Read this for more info:
http://blog.qt.digia.com/blog/2007/11/27/theming-qt-for-fun-...