[Tutor] askopenfilename puzzle

[Dewitt Chris-GCPD001]

I am taking over support on a python script written by a former college.
The script uses askopenfilename to select a file and everything works fine
but there's one thing that puzzles me.  After the first time you navigate to
a file it remembers where you were, even after you've exited the program,
shut down and rebooted the computer.  Someplace it's remembering where you
last worked and I can't figure out how.

Any clues?

Thanks,

Chris DeWitt