i did some research and found that kroete.dat is a template for the animation that you see when you hit F8 at the first grub screen
pressing F8 causes the pixels on the screen to start moving in a maze pattern
the pattern happens to be in shape of the SuSE pet
the animation routine reads kroete.dat two bits at a time and then moves the video pixels in one of four directions depending on the value of those two bits
the effect is interesting
it works when you boot from the openSuSE NET install CD