If you are trying to find a way to watch this today, Lost is available on major streaming platforms like Disney+ or Hulu in high definition, which far exceeds the quality of an old XviD rip.
This specific file format ( DVDRip_XviD ) and naming convention are typical of old-school or warez forums (like eMule or BitTorrent sites). Context for this Episode
It was a reliable link for fans in Italy to watch the show shortly after the DVD release.
This episode further explores Hurley's relationship with the cursed numbers (4, 8, 15, 16, 23, 42). Why "Useful Post"?