installing

Hello, everyone ! I did it! Today I finally downloaded an eroge from here lol. Please note this is my first post here, I don't know if this is the right topic, or if I'm going to stick around here a little more after that. But it went all wrong. The game is composed of a .mds and a .mdf file...

Hey guys have you guys ever play Samidare Growing Up? I have trouble installing this eroge. can you help me? here is problem that i got: i really want play this, please i really need your help

So like the title says, do you guys keep your iso files after you install a game, or do you delete it? I need some input, as i'm worried i wont be able to find a working download of a bunch of games in my collection if i decide to migrate to a new computer and am pondering should whether or not...