title: can't find references Microsoft.DirectX.AudioVideoPlayback and Microsoft.DirectX
body: <p>I've installed .net 4.0 as well as XNA 4.0 . A while ago I used <code>Microsoft.DirectX</code> to play some music and now when I try to redo the work, I can't find the reference. Did the new changes on the platform modify or moved something in the references?</p>