Hi, I added the URL Scheme x-apple.systempreferencesviadefaults write com.pilotmoon.popclip OtherURLSchemes -array-add x-apple.systempreferences.
Before this I already added some other URL schemes and tested whether they work. After adding x-apple.systempreferences"Open Link" didn’t appear in PopClip. I now deleted it in the plist file, restarted PopClip and “Open Link” is back. So it seems PopClip doesn’t accept x-apple.systempreferencesas an URL scheme.