I am in contact with a senior citizen who is running 3.1C (prefers to stay that way) and needs to reindex.

I see that his license is a 1 user development. It's a one person company.

When I try to run any system utility DFSORT DFFILE DFMAINT the program aborts with no error message immediately.

I don't remember how to fix this - is there anyone who still remembers what to do please?