For a long time, when I typed a directory specification in my run box, instead of the directory opening up in Nautilus, a terminal window would open. I have other user accounts on my laptop and found that my account was the only one with this problem. I want to go on and on about everything I tried but I’ll just cut to the chase: The problem was a file called mimeapps.list in the directory ~/.local/share/applications. The following line was present:
I changed it to
and it fixed it. That 1AGDMU seems like something that might be different on your computer.