It stores the addrbk.ini wherever the mirc.ini is, I bet, or whatever the $mircdir is (if you changed that manually via the Command Line options). This is the same as control.ini and other various ini files it needs to run, so there's no special reason/need to be able to specify a location for it manually. In fact, you can sort of specifcy a manual location by specifying the mircdir.. as such, you should just make your "ini" directory your $mircdir. Problem solved. You can do this via command line options, besides moving the mirc.ini around.
