Hey, I just saw your message. The setup in the example was created with the Wind Curve Force tool included in this editor (under tools).
To use it, add a curve to the scene, perform any edits and subdivisions you want, and click Create New in the Wind Curve Force box with the curve selected. It works best on highly subdivided curves. It will place a force object at each point along the curve, each pointing towards the next (with some smoothing). You can tweak the strength, falloff distance, and falloff power of the force fields by selecting the curve during creation (or edit existing values by selecting the object named CurveForce(.X) in the scene tab, editing the values in the tool’s box, and clicking Edit Selected).