I think it was just released yesterday (Sept 5), because that's when the oldest reviews are dated.
It's one of those older games (from 1995) that veteran adventure gamers consider unique, and one of the best. It's an unusual horror-type game, based on a story by Harlan Ellison, who voices the supercomputer "AM" in the game.
GOG claims their version works on Windows XP, Vista, Win7, and Win8.
"I Have No Mouth and I Must Scream"http://www.gog.com/game/i_have_no_mouth_and_i_must_scream
Only $5.99 -- a lot less than certain eBay prices.