Declaring headers in .NET

I'm kind of in the bind of learning API in C++ with .NET, without having a terribly good background in MFC. Being new to .NET (just a few weeks), I've been teaching myself .NET app programming, and I can't figure out for the life of me why I get 103 errors when I include vfw.h (I'm building an mp3 player). When I include anything else it works fine. But the compiler shows errors in that specific header file, where as that header works fine if I build an app in MFC and use it. Is there a catch to using MCI calls in .NET?

Any ideas?

Thanks!