trouble with files

i unzipped the .rar file for digimon world 2 and it gave me 3 files a .ccd, a .sub, and a .img. i need to know what to do with the files in order to play the game and i can't get the last 8 emulators ive tried to work with my computer includeing epsxe.

you mount the .ccd on a virtual drive such as elby clonedrive, and then use the 'run CD' option in your emulator after you have configured it.

Or you can simply load the .img image file.