FSX/P3D. Now personally, I am not much of a fan of WW1 era stringbags. But that doesn't mean these offerings from Vertigo are not well done. Because they really are. But as for my own tastes, it's WW2 and it's many vast aircraft it gave birth to that really gets my noodles boiling. Aircraft like the B25 Mitchell. Many of you may remember my reporting on such an addon [HERE] from this developer quite some time ago. Sadly, the project has been in stall status for nearly 2 years while the lead dev looks for another coder. As for the Nieuport 17 here, release doesn't look too far off.