There are some problems with DirectShow too apparently, but they aren't the same as DirectSound.
I know when I'm on Vista Play Music doesn't work from resource or otherwise, on three different machines I've tried at work.
"Q: Do we need to adjust the our code in anyway?
A: That's hard to say without know what your code does You need to test.
Vista has its own set of issues such WMP using Media Foundation for WM
playback, the presence of the EVR, new model for volume control per
application, etc."