Turbo Engine is a NEC PC-Engine/TurboGrafx-16, SuperGrafx, CDROM2, Super CDROM2 emulator aiming for maximum accuracy. In addition, it contains other nice features as well. ;) For CD ROM images, Turbo Engine only supports CUE/BIN/ISO + OGG/MPC. OGG/MPC support is there because most, if not all, of the rips I found were in either one of those two. In future, audio plugins will be supported which will allow other formats to be added as well.