CDI extensions, Daemon, and regions

[StartToday]

Okay, my friend has a problem with his emu. He's downloaded several, actually, and can't get any of them to play the ROM because it's got a .CDI extension. I would just download an emu or two and figure out how to use Daemon with it, but I don't have any ROMs to test out, so I figured I'd ask here.

I need to know what emu he should be using in order to play a .CDI file, and how to use Daemon tools along with it to play the image. Also, does it matter if it's a PAL region game?

[alcoatjez]

You can use Chankast or NullDC for .cdi files. They are both Sega Dreamcast emulators. IIRC you can load .cdi files directly from them without the use of Daemon Tools.