I have a question related to this. My 7 year old lad seems to be getting into Oolite but he wants as much in the game as he can possibly cram! He loves the Star Wars ships for example (and why not?!). But I don't necessarily want the same oxp's in my game, and I dont want to keep shifting them in and out of the folder.
I tried to make a copy of the oolite folder and rename it, just with his save file in, but when I loaded it it found all my files too.
So is the a simple way he can have his own installation with his own oxp folder?
You have already done what is necessary for a duplicate installation, i.e. copied the game root folder to another location. The fact that your savegames are still visible in your son's game is that Oolite remembers the location of the folder where it last saved or loaded games from. You will just need to navigate to your son's oolite-saves folder and once done, the default search location for savegame files will be that. You own installation will be looking in your savegames folder, as always.
Oh, and you will need to make another shortcut for your son's game's executable location, of course.