/usr/share/gnome-applets/ui/charpick-applet-menu.xml is in gnome-applets-data 3.4.1-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | <menuitem name="Item 1" action="Preferences" />
<menuitem name="Item 2" action="Help" />
<menuitem name="Item 3" action="About" />
|