To do that, I think I will download and install a trial version of Office 2013, open my notebook, then save it in the new format. I need to convert my file to the new format. My earlier version of OneNote (2007) was in the.ONE format which is not the format used by later versions of MS OneNote or by the Apple Mac OneNote App. Onenote For Mac Will Not Open Onepkg File Average ratng: 7,5/10 2932 votes File type