After the new deployment users old bookmarks stopped working, we found out that the issue is because of a new listbox object which has "Always one value selected" option.
So we wanted to Export the bookmark, edit its XML definition, and import it again.
But we are stuck at importing, after we edit the bookmark in XML, how to convert that .xml to .shared file.
The below link suggests for the same idea but no information about importing.
Re: Bookmarks stop working after document overwritten with a new version