Important information regarding using TripleHead2Go with Flight Simulator X: Acceleration 

Our friends at Matrox have informed us that for the best TripleHead2Go experience in Flight Simulator X: Acceleration, a small Flight Simulator configuration file tweak is necessary. This tweak will allow the field of view to properly adjust to your desired TripleHead2Go resolution.

The tweak is a simple one, and is easy to make manually, or with Matrox's new Surround Gaming Utility.

Details are provided in this article.