Thanks for clarifying the issue, yes, I can confirm that a m3u file containing those entries will not play on Media Center.
The MC log shows the stream is opened but is immediately closed again.
Opening the m3u with ffplay (the ffmpeg player) gives the following error: 'Invalid data found when processing input 0B'.
However, like Media Center, ffplay can play the stream directly if the url is used.
AFAIK Media Center uses ffmpeg libraries, so this looks like a 'shared' bug.
I can open the m3u successfully with VLC.