I run Windows XP and the wallpaper I used to have got lost. I have backups of the system itself, so if I knew where to look, I could find a copy of the old wallpaper.
I have some idea of the original filename (searching now), and I recall it saves it as a bitmap, but an exact location would be helpful.
It was a photo/JPEG that used to be on the filesystem, and I don't have backups, so the Firefox, and Internet Explorer wallpaper locations are unlikely. I checked
%SYSTEMROOT%\system32 as well - so I'm assuming it's somewhere else.