Hello Darren, thanks for the help, I never tried to open Notepad in admin mode before. unfortunately, this didn't work neither.
Here's what I get when I chose file > save > no txt estension > overwrite existing file.
Sorry my keyboard does not have a print screen button !
BTW, update interval is seconds, minutes or hours, day?
Edit : after more research, Googling and tests, I think there is no way to fix this problem, I tried everything. If I'm not the only one with this issue, it could be a problem for those wanting to customize settings after having installed Kodi as a Microsoft store app. One nice solution in my opinion would be that Kodi would let users choose where to put the preferences.
My Windows version 10, 1703 (creator's update)
Also another suggestion : addons should not be in the userdata folder, only the addons ' preferences should. EDIT 2 : my bad, the addons are not in user folder, sorry :/