Sorry to say no, but no you can't use MSFS files. MS Flight Simulator scenery files are really HTML programing that is compiled into .bgl files. All the objects are just macros that are called opon when the scenery demands (runs the macro) when your aircraft flies over it. There is no 3d objects involved in scenery. The aircraft that are used in the simulator are 3d and they are converted into a .mdl files.