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At first I made a picture for you:
http://i.imagehost.org/0107/FileStructure.jpg
Forgotten remark: the *.toc files are the sections.
>
> I just thought I'll have one notebook for organizing notes related to
> home, and another for organizing notes related to work (but resides on
> my home pc). I thought this would make it easier if some day I want to
> bring the work related notes to work and put it on my work pc.
>
> Perhaps this is the wrong way to use note, that I should have only one
> note "file", and create different sections for work and home?
Because the notebook is easy to transport/relocate by moving a single
Windows folder that was a good idea.
>
> But back to the original question. If you accidentally close your
> notebook in the onenote app, and the "file" isn't on the MRU list, then
> how do you open it back?
You use File, Open, Notebook ...
Where are your Notebooks stored:
In a standard installation under My Documents -> My Notebooks
But you can find your real path under Tools, Options, Save, Paths:
>
> I did manage to locate the "file", which is a onenote TOC file inside a
> folder containing other onenote related files.
You should never touch any Onenote files explicitely.
What you should use is a notebook = an equally named Windows folder.
Bernd