Just curious - what is the function of the File > Share With item? Couldn't find any references to it in DO's help, nor on these forums. I thought it may be equivalent to the Share With option offered by Explorer (eg right click a text file on your desktop and you should see it), except the DO Share With has no sub-options - it is just a single menu item that appears to do nothing when I click it, whereas the Explorer Share With has a sub-menu offering three options (Stop sharing, Create or join a homegroup, and Specific people).
It's the same menu in both cases, and not part of Opus. It may not work properly in Opus (or possibly anywhere but Explorer).