The Shadowkeeper editor? You can get it here:
http://www.sorcerers.net/Games/BG2/index_editors.php
It's a zip file- do you have an unzipping app?
Shadowkeeper works with Throne of Bhaal, but one bit of advice: don't use it when your party is in the Pocket Plane. Doing this has caused my game to crash. Get your party out of there, and on the map somewhere, before using it.
Linear Mode
