Yup, I played The 7th Guest on MS-DOS when it first came out, too.
A month or two after it came out, the creators (Graeme Devine and Rob Landeros,) gave a talk about game design at the local science museum. They asked how many in the audience had played it (about half raised their hands,) then how many had beaten it (only my friend and I did.)
They gave my friend and I some little trinket (pen? I don't even remember what it was any more.) I wish I'd kept it.
Definitely buying this. Already own it on iPad, but it would be nice to play it on the main computer, as well.