Maybe something useful in one of these? They aren't Netbeans specific but seem to explain how to configure custom ones.
-do-i-configure-custom-url-handlers-on-os-x
-to-map-a-custom-protocol-to-an-application-on-the-mac
Maybe something useful in one of these? They aren't Netbeans specific but seem to explain how to configure custom ones.
-do-i-configure-custom-url-handlers-on-os-x
-to-map-a-custom-protocol-to-an-application-on-the-mac