In MoI program, under Options > General, clicking on "Edit .ini file" button will show the Path to moi.ini

For Windows 11, or 10, my path is C:\Users\<my_identifying_name>\AppData\Roaming\Moi\moi.ini

- Brian

I knew it was an issue with permissions but formerly I fixed it by unchecking READ ONLY on ini file.
Now I had to add my user to permissions (or I could change owner to my user) even if I am member of administrators on PC.

Weird.

But it's fixed.

Thanks guys.