If you open DS and select the option to create a new world, you should have the option to select a standalone DS world or a docked world with C3 (click on the DS symbol labeled "Capillata only" ).
Note that you'll need an Offline option of some description to actually open the DS world, though. Arnout's guide has a link to one.
What's Capillata? (I think it spelled it wrong.)
I'm looking through the 'Quick Start' manual that came with the game when I installed it.