( resource psdoc, float llx, float lly, float urx, float ury, string filename )
Places a hyperlink at the given position pointing to a file program
which is being started when clicked on. The hyperlink's source position
is a rectangle
with its lower left corner at (llx, lly) and its upper right corner at
(urx, ury). The rectangle has by default a thin blue border.
The hyperlink will not be visible if the document is printed or viewed but
it will show up if the document is converted to pdf by either
Acrobat Distiller™ or Ghostview.