Where is the Desktop Slideshow using RSS as the source, for Windows 7 RTM?

"This works. I based it on the 'Bing.theme' examples, and changed the RssFeed url, from Ivo's answer.

[[Theme]
DisplayName=Bing

[Slideshow]
Interval=1800000
Shuffle=1
RssFeed=http://www.nasa.gov/rss/lg_image_of_the_day.rss

[Control Panel\Desktop]
TileWallpaper=0
WallpaperStyle=0
Pattern=

[Control Panel\Cursors]
AppStarting=%SystemRoot%\cursors\aero_working.ani
Arrow=%SystemRoot%\cursors\aero_arrow.cur
Crosshair=
Hand=%SystemRoot%\cursors\aero_link.cur
Help=%SystemRoot%\cursors\aero_helpsel.cur
IBeam=
No=%SystemRoot%\cursors\aero_unavail.cur
NWPen=%SystemRoot%\cursors\aero_pen.cur
SizeAll=%SystemRoot%\cursors\aero_move.cur
SizeNESW=%SystemRoot%\cursors\aero_nesw.cur
SizeNS=%SystemRoot%\cursors\aero_ns.cur
SizeNWSE=%SystemRoot%\cursors\aero_nwse.cur
SizeWE=%SystemRoot%\cursors\aero_ew.cur
UpArrow=%SystemRoot%\cursors\aero_up.cur
Wait=%SystemRoot%\cursors\aero_busy.ani
DefaultValue=Windows Aero
Link=

[VisualStyles]
Path=%SystemRoot%\resources\themes\Aero\Aero.msstyles
ColorStyle=NormalColor
Size=NormalSize
ColorizationColor=0X6B74B8FC
Transparency=1

[MasterThemeSelector]
MTSM=DABJDKT"