FSX. Even though the CEO of FranceVFR doesn't seem to like me very much, it wont stop me from promoting his products. I hold no grudges. Now if you are anything like me and you use P3D, you have already discovered that every time you install a new scenery, autogen in other places tend to disappear. FranceVFR's Autogen Global X is a program that allows you to initialize your autogen definitions without having to reinstall your scenes. In addition it provides a single set of definitions compatible with the products of many publishers who can then be used together. it's free so check it out!