There was a similar post, not too long ago in this group. It think the original poster found a solution and posted it. It's not exactly what you're looking for, but is similar.
I'd be willing to take a stab at something like that for you, though if you want it free, it would be on my timetable. It wouldn't be terribly difficult to program for you.
A couple of things to think about:
What do you want to store, number only, number and desription, etc.? Do you want to store a PLT file for each, as well? Do you have Access, Excel or similar file (goes to potential usability)?