The classic Control Panel allows everyone to add an icon to it. Most of those additions are quite pointless, like the Mail icon, which belongs to Microsoft Outl

The classic Control Panel allows everyone to add an icon to it. Most of those additions are quite pointless, like the Mail icon, which belongs to Microsoft Outlook and opens a configuration window you can easily access from within Outlook itself. The modern settings UIs are not extensible like this, nor should they be.