Is it the afcad-file, which says on which runways the airplanes can take-off and land?
In real LSZH, it is like this (and I think it should be possible to implement this in fsx):
Take-off: Runway 16 and 28 (seldom also 34 and 32)
Landing: Runway 14, 28 and 16 (seldom also 34. Of course, it depends on the wind).
By the way: The "gates" at Dock/Terminal B/2 on the side of the "Airside Center" (where Zürich Flughafen is written) are not used for passengers. So the boarding bridges should NOT connect to the aircraft. Those gates are just used, to park the airplanes. You can see this on the other side of the terminal: Until approximately 2003 or 2004, it was like terminal A with boarding bridges (jetways), now there are 2 or 3 parking areas for Embraers or Avros. In fact, the terminal is now used as an "event dock" with exhibitions.
Regards