This Preference pane is chiefly intended to be a modern replacement for the amazing RCDefaultApp developed way back when by Carl Lindberg, which stopped working in 10.12 due to deprecation of ObjC Garbage collection. Additionally, I guess it was a good way to teach myself Swift.

Installing & Uninstalling

• To install, double click on the .prefpane, and you will be prompted to install it.
• To uninstall, simply Ctrl+Click on the Prefpane icon and remove it, or move the .prefpane file to the Trash.