Hi Jan, I just tried your suggestion and it didn't work unfortunately. I am not sure if the MPEG-2 codec has been installed correctly. Looking at the list of codec under System Information - Components - Multimedia - Video Codec, and I can't see any that say mpeg2 or mpg2. Unless K Lite installed it somewhere else or as part of something else.
Anyway, Deskscapes still keeps telling me I don't have it installed and so won't apply the dream. I have also noticed that Neil Banfield's Star dream is no longer available on WinCustomize so I wonder if doesn't work anymore with DS11?
It's my favourite desktop background so I'd really like to get it working again.