/usr/share/gnome-applets/ui/mixer-applet-menu.xml is in gnome-applets-data 3.4.1-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | <menuitem name="Mute" action="Mute" />
<menuitem name="RunMixer" action="RunMixer" />
<separator/>
<menuitem name="Pref" action="Pref" />
<menuitem name="Help" action="Help" />
<menuitem name="About" action="About" />
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