That sounds exactly like my rear door when I went to the Annual Meet!
I only managed to get the window partly closed. So I taped the opening in case of rain.
Stripping the door isn't very difficult. But the wire going to the lock was difficult to fit again, in my case.
In my case it was the wire that had broken off.
http://forum.a8parts.co.uk/showthread.php?t=14232
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Johannes
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Audi S8 -99, Pearlescent, Alcantara/silk napa leather, Burr walnut insert, Alcantara roof lining upper pack
A8 32V engine
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Jeep Grand Cherokee -98