Creating New IFR Flight Plan for FSX

[aggrav8]

I haven't simmed for several years and would like to resume.  I've forgotten how to do something very basic. I use PlanGv3 (v 3.2.0.144) with FSX on a Win 10 system.
I want to create an IFR flight plan using Plan-G and execute it on FSX.  FSX seems to demand flight plans of filetype PLN (and I'm sure I have previously used Plan-G to create PLN plans, so I'm pretty sure it can be done).

But I can only create PLG flight plan files in Plan-G.  I seem to recall that I was able to force Plan-G to save a new flight plan as a PLN.  And then somehow force FSX to execute that plan.  Can someone walk me through this once?

Thanks and Best Regards, Gary

[tim arnot]

File->EXPORT. Then select P3D/FSX.