In earlier versions of Ubuntu, user-created launchers for the top panel were stored in the directory
~/.gnome2/panel2.d/default/launchers. This is no longer the case in the current versions. The Official Ubuntu Documentation at present lacks even the most basic information on this topic (the HowToAddaLauncher page "needs updating to include the latest versions of Ubuntu").
In Ubuntu 14.04 running Gnome Metacity Flashback, where are the files for the user-created panel lauchers located? Can these simply be backed up and copied into the appropriate directory of a new installation of the OS to provide a customized top panel upon reboot?