I have both P3Dv2.3 and FSX installed and I have the CS 777-200 (FSX and P3Dv2 versions) and I have no problems at all with the CS 777-200, -300 or Freighter, in P3Dv2. They work just fine.

It might depend on where you have FSX and P3Dv2 installed. Mine are:

FSX is installed in J:\Flight Simulator X (1st partition of the 3rd HDD (*1TB))
P3Dv2 is installed in H:\Prepar3D v2 (3rd partition of the 2nd HDD (2TB))

So they are (1) NOT in the C:\Program Files or C:\Program Files (x86), (2) they are not even installed on the C: drive, and (3) they are not installed on the same partitions (in fact they are both on different partitions, on different HDD's).

At one time, I had both FSX and P3Dv2 on the same drive and on the same partition (J:), and the Captain Sim 777 for P3Dv2 worked fine for me then too. :)

* My 3TB HDD is IN my computer, but I haven't initialized it yet because I am still wondering how many partitions I will divide it into, and I have to decide what will go on which partition. So at this time, I am still using 2x2TB HDDs and 1x1TB HDD, with 1x3TB HDD not in use. Call me crazy, but eventually I will figure it out. I just didn't think I would still be undecided on what to do by now. :o


[edit]And one more thing. Both FSx and P3Dv2 are always run using 'Run as administrator'![/edit]