Hi Nomad,
there it is - the link to the VDO MO5712 navboot
http://www.megaupload.com/?d=1QRVANZP
The guy who extracted this file for me, told me that there are about 10 navboot files on the VDO OS CD - all of the same size of approx. 3 MB.
Hopefully you can find out, if there are images included within this navboot and how they are extractable.
Kind regards,
Matthias