I use Cacko Lite and I have "addressbook 1.23-lite-1" installed.
(This is the same addressbook that comes with Cacko 1.23 full)
The data files seem to be here:
/home/zaurus/Applications/dtm
My C3100 has 27 files in this directory.
BTW, when I was looking for these, I found my personal info here:
/home/zaurus/Applications/addressbook/businesscard.vcf
Open it in a text editor and you'll see your personal info,
(that is if you filled in this info, in Addressbook -> Data -> owner information...)