Desktop pictures are usually in the MediaFiles.pkg file. You can open this .pkg-file with Pacifist.What is the name of the package on the installation DVD that contains the wallpapers? And how do I extract them from the DVD?
Why do you need the wallpaper? Why can't you google image it?
If you need the wallpaper its located inCode:
What installation DVD? An app? Or Mac OS X? If so, which version? Snow Leopard? Leopard? Tiger?