although I have no idea why you would run Apache on a Windows server.
Because sometimes you're forced to use a Windows server platform yet at the same time are under budget constraints and can't afford Microsoft's licensing models.
Correct me if I'm wrong (and I hope I am) but since KDE and it's libraries is based on the GPL'ed version of QT, it is itself GPL'ed, which means that you need to GPL your code is you want your app to integrate with KDE..????????
You are correct. KDE applications currently must be licensed under the GPL.
PLUG IT IN!!!