Steam ROM manager is neato.
...And boy howdy am I glad that backing up your library has still remained a legal thing, lol. Some of my OG copies of these games are showing their age, I don't think my poor old used copy of Luigi's Spooky House would run through a whole playthough anymore.
Would be
nice if I could play these on my Switch and save myself the hassle of doing it this way, but hey, at least Nintendo can't stop you from backing up your own stuff.
Although, one of my project goals for later this year or next year is to source them from my own copies. Being my own supplier cuts out...Headaches, for stuff I have a copy of, anyway. Out of print, abandonware stuff is still a pain.