Curious as to what else was under Microsoft’s elaborate lock, key, and duct-tape protection scheme mentioned earlier, I had my friend Chris Holmes run a scan of his 7 system, as I’m still babying my laptop’s SSD drive. What we found were ties into system files littered across the entire operating system. Post-analysis revealed another feature tucked away in the corner – Say hello to (what I think should be called) Desktop Slideshow. If your memory is sharp, you’ll remember Long Zheng found mention of this very feature on MSDN first, of which was quickly sanitized by Sinofsky’s secret police.
Full article- http://www.withinwindows.com/2008/11/03/windows-7-to-let-users-create-a-desktop-slideshow-from-files-rss-feeds/