Hi
This works for me
Step 1 - Setting default program
1 - Open Control Panel
2 - On View By click on small Icons option
3 - Click on Default Programs icon
4 - Click on Set your default programs icon (Waiting for loading message)
5 - On list (left side), select OneNote (desktop)
6 - Click on Choose defaults for this program link
7 - Click on checkbox Select All
8 - Click on Save button
Step 2 - Checking default program
1 - Open OneNote (desktop) program
2 - If it isn'showing the message "OneNote is not your default...." - It works !
3 - Click on File menu
4 - Click on Options menu
5 - Click on Advanced options (left side)
6 - Scroll the bar until Default OneNote Application
7 - If the option is selected, it works ! you won't see the message again.
By Condé