alt Hacker NewsDBase/Fox Pro were born when local networks weren't common, it excelled as a single-user batteries-included IDE. Now that you mention this, I understand why it couldn't work these days as it is.
I also think it won't be that hard to make it multiuser, that's a long-ago solved problem these days.
It wasn’t that hard to make it multiuser back on the day, either. But as OP discovered, FoxPro also made it very easy to write shit multiuser code. Pessimistic/optimistic locking, etc.? It was in there, but you had to use it.