Copying DVD to desktop
I have a dvd that I copied to my desktop using disk utility. It's a .cdr file and a DVD/CD-R Master image. I can't view it or hear it though the image seems to have all the files of the original dvd.
Do I need other software or have I made an error in copying the dvd?
Thanks
iMac, Mac OS X (10.7.4), late 2009