Darvond: Oh, it's you. The person who we figured isn't actually using legitimate copies of your games or is doing something quite bizarre.
If you're seriously trying to run the version of Myst from 1993, you're clearly trying to run it off a CD, as
there never was a digital version of Myst (1993) for PC. And as such, GOG Galaxy isn't made for running your literally bespoke original executable files. It is for running patched executables of which GOG themselves have had a large hand in doing.
You can try, but I'm not sure if Galaxy even supports arbitrary executables.
I'm not trying to use a CD (don't even have one of this game, or any Myst game on CD) or or do anything wrong or anything, honestly. I apologize if I somehow caused any problems. I don't know why this keeps happening, and to only me. I am going through my similar Ultima VIII problem, and asked Gog's help section. They were able to remove that game from my "Owned games" listing on my Gog Galaxy for me, but the Ultima VIII link is still under Gog Galaxy's "Games", and when I click on it, I still see the game name and pics from it and everything, and a circle and "Other" below the name at the top, instead of the standard five-stars and Gog logo in fully-working games on Gog Galaxy. What does that mean? What's happening? I can't seem to find the original 1993 Myst now, so I guess it was a glitch that got fixed? It also had that circle and "other" under it.
