I love Captain Sim and own alot of their products, including the Space Shuttle :D  I was so happy that my $70 CDN wasn't wasted with P3D.  I do own FSX but it's not installed.  Captain Sim 777 + FTX GLOBAL = Sim Heaven :)

p.s  I had to add this in the DLL.xml to get more sounds that were missing:

<Launch.Addon>
    <Name>Captain Sim 777 Sound</Name>
    <Disabled>False</Disabled>
    <Path>Captain_Sim\777\cs.sound.dll</Path>
</Launch.Addon>

I also have to mention/confirm that i'm on Win8 64bit ;)  and the 777 works flawlessly in my P3D.