Take a step back: while it's convenient to have the PanelView Plus show up in the RSLinx Classic browse, it's not necessary.
RSLinx Classic doesn't do anything with PV+: all upload/download/configuration is done with FactoryTalk View and RSLinx Enterprise.
RSLinx Enterprise hardware support is hard-coded into the various releases; it doesn't use EDS files at all.
While figuring out the subtleties of several-years-old RSLinx Classic and EDS registration might be intellectually satisfying, it won't do much to help your project move forward.