3D Connexion deletes RhinoFS.xml

Hello, I have the same problem, I am using Rhino 7 and 8 with Space Mouse Pro and Cad Mouse.
Can I ask you the courtesy to explain me step by step how to “allow the creation of a new file” and how to edit the XML file by adding, I assume, in my case. the string “Rhinoceros 7”.
I am not familiar with these things. I need to solve and be able to use both Rhino 7 and 8, because the latter currently has major problems with objects “jumping” into the scene using Space Mouse ( here: Rhino 8 - Spacemouse 'jumping')
Thank you.
-Simon