What do i do after i download?

This is the file i downloaded: https://www.romulation.org/PSX/Digimon_World_[U]_[SLUS-01032].rar.html/Now what comes next?I created a new desktop folder. Placed the .rar in there. Extracted all (three) files into it. Now what do i do so i can being back some amazing child hood memories? lol

You need an Emulator to play your newly downloaded Playstation game.Start here:
https://www.romulation.org/forum/index.php?topic=8528.0

Tyvm, Looks like i got some homework todo lol