The German, on his stallion Magnus Romeo, was fastest of eight finalists and his win means that after 11 legs so far in the 2012-13 campaign, there have been 11 different winners.
"I can definitely say that France is good to me, I already won the Grand Prix 5* in Chantilly last July," said Dreher, whose win came on the eve of his 41st birthday.
The course in Bordeaux was designed by Uliano Vezzani, the same man who created the course in Chantilly - and who will be in charge of the course at the finals in Sweden.
"I just got to know he will be the course designer at the final and it’s a good omen for me," Dreher added. "I am very excited because it will be my first final."
Dreher sealed his place in Gothenburg ahead of Sweden's Henrik Von Eckermann with Gotha FRH and Pénélope Leprevost of France on Nayana, both of whom did enough in Bordeaux to qualify anyway.
"I am very happy because it will also be my first final and to compete in my own country will be even stronger in terms of emotions and motivation," Von Eckermann said.
The next and final stop of the World Cup tour is S’Hertogenbosch in the Netherlands from March 14 to 17, before the finals which run from April 24 to 28.
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