In a field boasting some of the best dressage riders in the world, Langehanenberg won the day with a round judged at 82.468 per cent.
Dutch world number one Adelinde Cornelissen, with Jerich Parzival, was second best, ending her 100 per cent run of since the Olympics.
Cornelissen's compatriot Patrick van der Meer, riding Uzzo, scored 81.702 per cent to claim third, while Patrick Kittel was notable by his absence, the Swede having been forced to pull out with a bout of flu.
In the Freestyle Grand Prix a day later, Cornelissen rediscovered her winning form, climbing onto the top step of the podium with a score of 88.875 per cent.
Langehanenberg could only manage second this time (85.875) while Germany's Nadine Capellmann with Elvis VA took third, some way behind with a score of 76.375.
The next stop on the tour is Amsterdam, from January 18 to 20, for a World Cup qualifier.