Where are the Win 10 Quick Access settings stored?

The Quick Access items are stored in this file:

%appdata%\microsoft\windows\Recent\AutomaticDestinations\f01b4d95cf55d32a.automaticDestinations-ms

You can do this with group policy - here is how I do it: Create shortcuts to the shares in %USERPROFILE%\Links: GP preferences - shortcuts

Set the shortcut details: GPPref details

Then again use GP Prefs files to delete the jumplist file %USERPROFILE%\AppData\Roaming\Microsoft\Windows\Recent\AutomaticDestinations\f01b4d95cf55d32a.automaticDestinations-ms: enter image description here

The jumplist file will recreate a moment later with the contents of the links folder