Thanks, I'll try it and give you some feedback.

[edit]
A few days later, I finally closed and reopened Factorio: Success!
Your method worked just fine, now I have it working with my favorite preferences.
Thank you!

This is probably a silly question, but I can't find any answer to it anywhere.
I would like to know whether it is possible to make permanent option changes.
I don't want to have music and I also change the WASD keys, but I have to reset them every time I start again, and even if I then load a ...

thank you, that did it!

I can't start Factorio because of a conflict with mods.
It begins loading stuff, then stops with this error message:

Error while loading item prototype "module-case" (tool):
Prototype "module-case" registered twice
Modifications: bobmodules

Please tell me whether I can unload the mod(s) from the ...