Onenote files are saved as a Web link, instead of a .one file

Hi Jonathan,

Thanks for writing back to us.

If you sync the folder that contains notebooks (Created it on OneDrive) in OneDrive, you will get a stub .url file, which will open the note on the website which is an expected behavior.

As workaround, if you want open OneNote notebooks in Offline which are stored in OneDrive:

Open the all required OneNote notebooks (stored in OneDrive) in application when there is an internet (don’t close the notebook or quit application) and when the internet is disabled you can still see and edit the notebooks but changes made will be sync once internet is enabled.

Additionally, you can also create a notebooks locally (instead of OneDrive) via (Open OneNote 2016 for Windows> File> New> This PC> enter Notebook Name> Create Notebook) where this notebooks are stored in your PC as .one (where internet is not required)

If you want to check all the restrictions and limitations when you sync files and folder, refer this article.

Regards,

Chitrahaas