[Flash8] fscommand (fullscreen) on extended display

hello -

does anyone know how to get a projector file to open run fullscreen on whatever display the ‘window’ is currently on?
no matter what I try it always repositions to the primary display -
(fscommand(“fullscreen”, “true”); applied by itself - and on a ‘button’)

I don’t want to rely on having users reset their extended display as their primary display - and in fact when running multiple displays from my laptop - changing the primary display is not an option.
it seems that running the presentation in mirror display is what people are currently doing? Though I don’t see how running fullscreen projector files only on an extended display hasn’t been an issue for someone before -

any help/info is appreciated -

please tell me if this is even possible to do or if i am wasting my time

thnx in advance!