I found the website for Master Cook and wondered if you knew about it? The original company that made the first MC was Sierra but the program just got too big and required too much work for them to keep it upgraded. For several years, it has been sold by Valusoft. Here is the link to that page on Valusoft's site:
MasterCook at ValuSoft
This is their tech support for Master Cook. Perhaps you can find the answer you are looking for there.