The very existence of the series of suggested solutions since my previous post indicates how urgent is the need for a final, fail-safe, top-tier, vendor-level solution. That solutions to the dysfunction built into the XP11 scenery routines are far too ad hoc, hit or miss than should be at all acceptable for such a mature platform as XP is now. I think the entrance of ORBX into the XP world can only be a boon to Laminar and the future of their sim, so I think it behooves them to speed up a revamp of the scenery routines.
For many of us old hands, whether from XP or FSX, mucking about under the hood has just become part of the sim experience and cutting and pasting items in a text file is really old hat; however, the various threads here initiated by new users absolutely mystified by the process of getting their new ORBX scenery to work in this already sophisticated sim suggest it's in the interests of both ORBX and Laminar to iron out a user-friendly solution. (Part of my embrace of FSW was that it worked without having to fiddle with anything; I still think that was one of the enviable bars set by that platform)