In working with a user of Family Tree Maker, and this problem is probably not just the program, a GEDCOM generated INDI number was used to link a person to an image, on a Website. The user was using this INDI Number ot image on the website for a while and was working for him.
The user updated the computer, installed the program on the new computer, transferred the file from one PC to another using a GEDCOM file.
It appears that Family Tree Maker does nothing with the INDI number once that GEDCOM file in opened the program. That INDI number of for identifying a person within that GEDCOM file. Once in Family Tree Maker a new or internal number is assigned to each individual.
Now, when Family Tree Maker export this new file, from the new computer, a New INDI number is assigned to that person, again because that number is unique for that GEDCOM file. When uploaded to a website, where the INDI number was linked to a specific image, the links are no longer the same.
The problem now is that all of the Links are incorrect.
It appears that when transferring the GEDCOM file from one computer to the other, the next GEDCOM file created from the new computer will have a different INDI number.
There are other options of tracking a person within our programs, but the INDI may not be a reliable one to make these links.