As a start you could use the following sample in order to put the image on the clipboard as a metafile.
WINAPP
INTEGER ctrl,start_cb,winio@
EXTERNAL start_cb
INTEGER N,i
PARAMETER(N=11)
REAL*8 x(N),y(N)
DO i=1,N
x(i)=i-1
y(i)=x(i)**2
ENDDO
ctrl=999
i=winio@('%`pl[x_array]&',400,250,N,x,y,ctrl)
i=winio@('%sc', start_cb)
END
INTEGER FUNCTION start_cb()
INCLUDE <windows.ins>
INTEGER ctrl
ctrl = 999
CALL SIMPLEPLOT_TO_CLIPBOARD@(ctrl)
start_cb = 1
END
Then it might be possible to copy from the clipboard into a %gr region say, perhaps using play_clipboard_metafile@.