It is an outlook file... at least that is what I thought.
Personal Mail box is the best answer I could get last time
I tackled this problem.  the full name is the only info I
found on the microsoft site.

I don't remember the path - it's been awhile.
I thought it lived somewhere in the program files tree.
It was part of a set of files that I would backup to a cd
whenever there were going to be big changes to my
machine.  It contained addresses and a personal calender
that was additional and seperate (also not on the company
server).

I am sorry if this is till not clear.

I have several pst files and I have no problems opening
them, but they contain emails only.  I am trying to
restore my address book.