A .bin image is a raw image format and is approximately 19% larger than an image of the same cd in standard .iso format.
If the original cd were copy protected with e.g. safedisc the converted image (i.e. in .iso format) won't work either when burnt to cd or as a mounted image.
However, no matter, if that's the case, you can always make a fresh image of your original cd in an asppropriate format.