There are potentially three data files for each site: turnpoints, airfields, and user-specified waypoints [ e.g. restricted areas, potentially landable fields, etc... ]. The file names use the site name compressed to five characters, plus _tp for turnpoints, _af for airfields, or _ot for other, with the extension ewv; e.g. for Moriarty: morty_tp.ewv, morty_af.ewv, and morty_ot.ewv.