Did you try putting a link to that presentation in /home/knoppix/.kde/autostart folder? If you did not try it please do, I think it should work. If it does not work then try the following:

Make a file like this:
code:

#####Start#######
#!/bin/sh

ooimpress filename
######End########

Where filename is the name of your presentation file. And put it in /home/knoppix/.kde/autostart folder. It should work. Good luck