DNS name doesn't work for multicast in Windows client
See http://forum.videolan.org/viewtopic.php?p=84920.
Using !udp://@video.domain.com works in the Mac client but in Windows it fails with "Unable to open '!udp://@video.domain.com'." Using !udp://@239.192.1.1 works and DNS name does resolve (e.g., when using ping).