What is an onetoc2 file and how do I open an onetoc2 file?
ONETOC2 is a Microsoft OneNote index file that stores information about the order of note-taking sections. It is used to organize a collection of notes in a notebook. If the ONETOC2 file is deleted, OneNote will display the notebook sections in alphabetical order, which the user can manually reorder.
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How to open onetoc2 file on Wikipedia
How to open onetoc2 file on Microsoft.com