I am looking for a way to interact with a standalone full version of Windows Media Player.
Mostly I need to know the Path of the currently played track.
The iTun
Just add a reference to wmp.dll (\windows\system32\wmp.dll)
using WMPLib;
And then you can instantiate a media player
var Player = new WindowsMediaPlayer();
// Load a playlist or file and then get the title
var title = Player.controls.currentItem.name;
See Creating the Windows Media Player Control Programmatically for more information