How do I convert an aircraft for Microsoft Flight Simulator to use with X-Plane?
Sorry, you can’t. The flight models are conceptually different, so no automated conversion is possible. The MSFS flight model is behavioral – that is, a large table of numbers deterines how the aircraft will behave under a certain set of conditions. The X-Plane flight model is structural – that is, X-Plane computes how the plane flies based on a model of its structure and other engineering parameters. MSFS also has a 3D model of the aircraft for external display use, but converting this to the X-Plane aircraft model would leave a lot of missing data. In addition, many of the more serious MSFS aircraft use plugin features that have no counterpart in X-Plane.