I've tried to use the most recent version of the NPC_tool (4b), and I edited my villagers.. But when I get to the original screen (the one that says Edit NPCs, Export Textures, Save and Exit, etc), the villagers on the scroll-down list are still the same. I also noticed that it took only a second or two for the edited save file to be installed into my Wii.

Is there any way to fix this? I'd really like to change my neighbors.