I keep all my preset library files no bigger thatn 50Mb. I have dozens of them and swap them in and out of the presets libraries in Bryce using the Bryce Librarian from wolfiesden.com. It's easy and you can swap whole preset files in & out of the User, Tutorial & other categories without leaving Bryce, by keeping the librarian open in the background. If you are still using B4 get it, it's a great program. I understand that for B5 it's not necessary, as you can have unlimited categories of user files and split them up however you like. I've posted other comments on threads over at 3Dcommune. Check the Bryce forum there & search for "Bryce Librarian" for more info about that if you are interested.