Running MI3 CD2 on Windows XP

I downloaded ScummVM today and managed to play CD1 with no problems at all. Unfortunately, when I load CD2 and try to open it via ScummVM I get an error message that reads 'Insert Disc 1 into C Drive. Press OK to retry, Quit to exit' but it doesn't work when I do that.

I've even tried copying the files on CD2 like I did with CD1 but nothing happens.

Any help would be very much appreciated.

Thanks!