That's good news and your FDD worked after 25+yrs...
Those 2 Files PLC/PAR were the only thing between a run-able machine and a boat anchor if, the battery went dead. Now, for the good/bad news that you need to know about IF...you can't find or get from the people you bought the machine from the CNC EXEC software FD's...see below photo is what they look like
Attachment 436816
...the good news is Dynapath is still around and I think for a price (not cheap I'll bet) they can send you the CNC EXE and Options Files
DynaPath