Probably important to note.
In my RW video's where I show the transition from RW to HL with the monsters. I don't use the encounter builder there.
You create the monsters in RW using HL snippets and simply build the monsters via the process shown. That enables the transition from RW to HL. The Encounter builder is there though with 375 options.
I just loaded up the 3.5 set in demo mode and there's 135 races. Adding the community pack mentioned by Shadow above bumps that to 467!
Check out the
demo mode, see if you like it.