I was just looking as how to convert CDR image I made while back and
while your utility look promising, there is no support for CDR =>
ISO conversion.
I found on line but it would be helpful to have it for example in
your menu driven GUI :
Converting CDR to ISO via Command Line
If you want to be certain the ISO conversion and its headers are
accurate, jump to the command line by launching Terminal, found in
/Applications/Utilities/, and then using the following hdiutil
command: