FSX Steam?

Hi,

I presently run REX on P3D V2. I have just purchased FSX Steam. Would I simply run REX again and let it run into FSX Steam? Also, does REX even run Steam Edition FSX? I know my addons for FSX-S run fine, but REX is pretty exotic, so I thought I should ask first.
Please help.

I didn't find the right solution from the Internet.

References:
www.dsdxfbg.com/forums/index.php?/topic/35052-fsx-steam/
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Thanks