how good does this expansion pack sound
Memphis Belle for FS9 is popular. I have no idea if it'll work in CFS3.
I know that one will work but the link I gave to you may not. You can always try it, I hope it doesn't mess it up. I would just put the aircraft folder into the main folder and not put gauges or anything else in the other folders, just to see if the B-17 shows up and fly's.
Good luck with whatever you do, it's a fun game.