To answer you question, yes it is the Killer Instinct emulator. The one I have is the 3.11 build. I realize I can play both just fine through MAME and I have numerous times. I have the .chd files for both in MAME and when I went to play it, that's when I noticed that its not showing in my game list or showing as an available game (MAMEUI 140). My chd files are correct, I have the correct roms, everything. I decided to try U64 until I figure out what happened to both Killer Instinct games. I used chdman to try and update my chd files (thinking that might be the problem) from v3 to v4 and they show Killer Instict as a working game but ERROR.