Hi everyone.

Since first getting P3D, I was able to port over the default aircraft from Flight Simulator 2004. However, since P3D v4, I am unable to successfully port over these aircraft, most likely because they aren't compatible with the 64-bit architecture. The FSX aircraft still port over just fine, but the FS9 aircraft load up as invisible aircraft with no exterior or interior graphics. Only sound, and I believe flight characteristics (I haven't bothered to try flying them in their current state).

Is there any way whatsoever to configure the FS9 default aircraft to properly port to P3D v4? Believe it or not, there are a few planes from that simulator I'd still like to fly, particularly the historic aircraft like the Spirit of St. Louis, Vickers, Wright Flyer, etc, etc.

Even FSX planes will struggle in v4. Here's the thread from shortly after v4's release - when we had no good GA planes to fly in the sim - where Russ Sisco and I tried our best to make a bunch of Carenado planes work. It was an epic effort, but lots of problems were encountered, to say the least! I managed to wreck my copy of Prepar3d in the process, necessitating a full reinstall.

https://www.avsim.com/forums/topic/511874-a-test-pilot-report-on-the-carenado-c337h-skymaster-in-prepar3d-v4/

In that thread you can see that the non-visible aircraft parts that you mention are a problem even for some of the older FSX-compatible Carenados.

If you're serious about getting FS9 planes to work in v4, you'd be looking at replacing a lot of gauges for starters, and then troubleshooting the "missing" structural component. Not an easy project by any means. 

Hmmm, isn't that like burning firewood in a microwave oven