Or you could just download daemon tools from
http://www.daemon-tools.com then use this neat little virtual cd rom drive, mount the .cdi image.
Then using either Blindread/Blindwrite or CloneCD make another image then burn using a different piece of software.
Only use either of these two software packages though, or one that is capable of doing a 1:1 copy. (dont use nero)
Actually on second thoughts there is a cdi2nero program that you could try, youll find it on this site.