1- What FH docs doesn't FH open? I do not remember it happening to me, but I have few very old docs (they were mostly updated on customer demand at least once every second year so they are in FH 9, 10 or MX.
2- Is the idea of having a dedicated FH engine (perhaps under licence) to convert and THEN open vintage docs feasible?
3- A script which would search all FH docs on all HDs then convert them (in place or in one selectable location) to one usable format (keep the font live!) might be enough for most needs, whaddya think?
4- Whatever the complexity, I believe for many the conversion is essential.
I think that if FreeFreeHand has any leverage left on A. after this catastrophic negotiation, please, using it to obtain access to the necessary file format from A. would be the least thing they can still do. Reverse engineering does not sound promising…