full
Developer
This is from the P3D forums
"Note, first off, that we haven't announced 64 bit support for 2.0, and I can't comment on where 64 bit support falls into our product road map at this time. As such I can't really answer your question other than to say that add-on scenery generally doesn't include dlls that run in Prepar3Ds application space the way that many add-on aircraft do, and that in all likely hood, there would be very few scenery issues if/when we move to 64 bit. We are adding some features to the model format for 2.0 though so 2.0 models won't work in P3D 1.x, ESP, or FSX. Older models should still work in P3D 2.0 however."
Beau Prepar3D Software Engineer
Link here ---> http://www.prepar3d.com/forum-5/?mingleforumaction=viewtopic&t=2870.0#postid-12476
"Note, first off, that we haven't announced 64 bit support for 2.0, and I can't comment on where 64 bit support falls into our product road map at this time. As such I can't really answer your question other than to say that add-on scenery generally doesn't include dlls that run in Prepar3Ds application space the way that many add-on aircraft do, and that in all likely hood, there would be very few scenery issues if/when we move to 64 bit. We are adding some features to the model format for 2.0 though so 2.0 models won't work in P3D 1.x, ESP, or FSX. Older models should still work in P3D 2.0 however."
Beau Prepar3D Software Engineer
Link here ---> http://www.prepar3d.com/forum-5/?mingleforumaction=viewtopic&t=2870.0#postid-12476