/usr/share/gnome-applets/ui/cpufreq-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="CPUFreq Preferences Item" action="CPUFreqAppletPreferences" />
<menuitem name="CPUFreq Help Item" action="CPUFreqAppletHelp" />
<menuitem name="CPUFreq About Item" action="CPUFreqAppletAbout" />
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