I agree, I just need to figure out the best way to present the plugin selection, I might do another form that pops up before launching - not quite sure yet.
Right click => Open Special. Show selector with V4 / V5 button and plugin chooser.
Some more stuff (sorry).
1. F5 to refresh view.
2. Stay in the same spot when refresh is hit. Remember where I was in the tree view and open that automatically.
3. Make the library / code separator bar dragable. So that I can make the library area wider.
4. Sorting is different than in the browser. Bot11 folder comes before Bot3 folder. In explorer it's the other way around.