"play to" from wmp12 doesn't play internet radio

I use the wd hd tv live solely as DLNS renderer, meaning, using the “play to” functionality in WMP12 under windows 7. although i can stream my local library, i cannot stream internet radio like  http://www.dradio.de/streaming/dlf.m3u to the wd tv via wmp12’s “play to” feature. error message:  http://screencast.com/t/NWQ2MmJj

any ideas?

That’s an incompatibility error from WMP, not from the WDTV Live.

Only Microsoft will be able to address that if you plan to use Play To functionality…