I see your point, but there's lots of room for error in a single xar file as well if you don't plan ahead. Ask anybody who's worked on a large multipage single xar file website. I have as it happens deconstructed a single xar file website for that very reason and now use the method I outlined above. Yes, it would be nice if XWD or XDP6 did the work for me and I'm sure in a later version we'll be able to link folders for that very purpose, but for the time being I'm pretty happy doing it my way.