[wedgemoose]

Yup the whole thing. Once you add your next wallpaper or the same one again. a different string will come back. In that string there was a number (when you started). Once you do what your doing, it adds a long line that you have above (\My Documents\My Wallpapers\wallpaper_003.png.)
But that "Data Value" is supposed to be blank(once you delete it)....good luck....

again, when you add your next wallpaper you will notice that box filled out again. The only reason I know this is because i was doing something with my wallpaper and noticed my Data Value had the similar thing you have