this is the DVD-ROM Edition of Fate/stay night, the megas awesome visual novel from TYPE-MOON.
if you already have a working copy of Fate, don't bother downloading this. it has no extra material compared to the CD-ROM edition despite being more than twice as large. the only benefit is that the DVD-ROM edition does not require any discs to be mounted/inserted and consequently does not require a no-CD crack. it does a disc check after the prologue with Rin and Archer, and after that the disc/ISO is not required to run the game.
i tried to trim this ISO but any file i deleted made the game fail the disc check. so sorry but you're stuck downloading 4.8 gigs on my shitty connection.