adding files into an image file

I am using Nero Burning Rom 5.5. I have just backed up a data CD in Joliet format as an image file. How can I add more files into the image?
Thanks!
Mark
Thanks!
Mark
Your source for storage related news and reviews.
http://www.cdrlabs.com/forums/
http://www.cdrlabs.com/forums/adding-files-into-image-file-t9971.html