how to get Discjuggler 3 to accept .cdi

[superjediman]

I'm sorry if I'm being thick, but how do you get Discjuggler 3 to accept a .cdi file??

When I try to open the file in DJ3 it wants a .cdj file. If I then choose all files then click on it, then the start button is greyed out.

Its just annoying me (got round it by converting it to a nero image)

thanks