Kontakt supports .X0V voices from Yamaha Motif series:
but it seems Halion cannot do it at the moment:
I’m really surprised cause I can see a Yamaha Motif XS photo in the Halion main screen 
Does Yamaha work with Steinberg or NI?
+1
Now more programs support Yamaha Motif and Yamaha Tyros library.
It is time for Halion to support them.