FS9 and FSX compatible. Commercial Level Simulation is releasing today a freeware ; the Piper Arrow. Process is simple, CLS explains that../..
CLS explains that you just need to add the product to basket and checkout and there will be no paiements required. The aircraft has a highly detailed 3D model, a virtual cockpit and standard animations ; landing gea retractable, opening door etc.
Also interesting, four panel styles and eight liveries.
Oh it's cool a free aircraft, but i am shure someone told you (at least once) that nothing is free in this world...