To install aircraft add-ons for Prepar3D, a number of files must be copied to existing Prepar3D folders. Prepar3D is fully compatible with FSX SP2 add-ons, including freeware and payware applications. These add-ons can improve your Prepar3D experience. Prepar3D® has the capability of being enhanced by adding add-ons of Aircraft, Scenery, Missions and more.