It sounds like the box already had windows installed, and the partitioner for SuSE has just left things "as is".
Though it could also be a default setting of some sort that automatically allows for a windows partition/installation for dual booting.
Now I can't say for SuSE as before I had gentoo, I'd mainly used Mandrake, and their partitioning facility always asked (with options) whether you wanted to use the same partitions or whether you wanted to set up the whole drive for linux - You could have a look at the SuSE/Novell
forum and see if there's anything there, or just hit google
and see what that throws out
p.s. Erm also maybe any documentation you might have either paper ones or at somewhere like /usr/share/doc