This was the last post in a forum I found:
Due to the increased security features of Windows Vista, the MS Active Desktop is not available in Vista. Therefore an animited .gif cannot be natively used for wallpaper.
However a Google search reveals 'Dreams':
Dreams are high quality animated wallpapers that run exclusively on Windows Vista Ultimate and transform the static desktop users spend all day looking at into a world of motion and activity.
src:http://www.talkgraphics.com/showthread.php?t=30618&page=3
EDIT:
Or this. This is actually kind of cool.
http://www.howtogeek.com/howto/windows-vista/bounty-program-success-active-desktop-replacement-for-vista/
Due to the increased security features of Windows Vista, the MS Active Desktop is not available in Vista. Therefore an animited .gif cannot be natively used for wallpaper.
However a Google search reveals 'Dreams':
Dreams are high quality animated wallpapers that run exclusively on Windows Vista Ultimate and transform the static desktop users spend all day looking at into a world of motion and activity.
src:http://www.talkgraphics.com/showthread.php?t=30618&page=3
EDIT:
Or this. This is actually kind of cool.
http://www.howtogeek.com/howto/windows-vista/bounty-program-success-active-desktop-replacement-for-vista/