1991 Microsoft Flight Simulator 4.0, Aircraft And Scenery Design, DOS. 1991 Microsoft Flight Simulator, Aircraft and Design, for DOS Systems, includes both 3.5" hard disc and 5 25" Disc, and users guide, box is still in shrink, open box but looks unused, I cannot guarentee or warranty this product, no returns, but if there are any issues please message me, feel free to message me with any questions. Both discs say 1990, box has 1991.