OK...I got it (Danish? clip about shark attacks on surfers) but as I suspected, it's the DRM protection that prohibits regular conversion. That's why you can't just right click and convert to the former tv format .dvr-ms. I'm gonna look a bit deeper into this right now.
As it seems there are a few shady apps out there that claim to remove DRM.
With my regular editors/convectors I get nothing.
You could use the trial version of TMPGEnc - Products: TMPGEnc 4.0 XPress - Product Overview
and see if that works for you
Sorry I don't have any better news
Edit: This software seems to work It converts wtv to dvr-ms but since I have only a small clip, it never finishes. just try it out (run the todvrmsgui.exe as admin) ToDvrms - 188.8.131.52 - andy vt's tools & blog
A short Howto: http://www.hack7mc.com/2009/02/conve...-to-dvrms.html