The Internet Mail provider and the Outlook/Exchange plugin of avast have the possibility of adding notes into ‘clean’ and/or ‘infected’ files.

You can edit the format of these notes, both in txt and html format.
The edited notes were saved into 4 files: aswInfTg.html, aswInfTg.txt, aswClnTg.html and aswClnTg.txt.

So, you can backup these files to not lose your notes format.

Default notes format are on the help file > Setting up the Mail Protection > Format of Inserted Notes.

Did I make myself more clear? 8)