The files are in your option18 folder:

APTG8.DBF & APTG8.MDX

I haven't had to do it in a while, you may need to copy the TODOSG.DBF & TODOSG.MDX also.

As an alternative, you may want to just copy the entire OPTIONS18 folder over, then roll it from 18 to 19 on the new computer.

I suggest renaming the OPTIONS## folders to OPTIONSold ( or a date) before you do the copying, in case something goes wrong.