Each icon in the control panel represents an applet with the .cpl extension. I believe the applets contain their own icons. The list of standard system applets to load is located in the registry at at HKLM\Software\Microsoft\Windows\CurrentVersion\Control Panel\Extended Properties\[key value]\. The list of third party add-on applets is located in the registry at HKLM\Software\Microsoft\Windows\CurrentVersion\Control Panel\Cpls.
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