First to file means that if have a working model and you talked to someone about it, they could get the patent.
Changing to first to file doesn't change the fact that only the inventor can file a patent. If you could show in court that your work was used to file the patent, you would win it back. Note that this is different from the case where someone else independently invents the same thing and files first.
"You can visit him if and only if you or your girlfriend knows where he lives."
"Goddammit, we both know, so now we can't visit him!"
Fixed
It's a naive, domestic operating system without any breeding, but I think you'll be amused by its presumption.