The downloadfile87n.zip file you have requested: Flight Simulator X / Scenery / Southampton, New York Helipad - 114.78kb is not available. Perhaps try browsing all files for the game Flight Simulator X and upload any files you want to share or are missing. This is the only information we could locate:
87N - Southampton Heliport, NY. This is a public helipad, the only public helipad on Long Island outside of an airport, that services the town of Southampton, New York. Air taxi operations are common out of this heliport. It shares a CTAF with Mattituck Airport (21N) to the north, but since FSX does not have helicopter AI traffic (unless you have an AI package installed for it) you really don't need it anyways.