Iso can not open

I have a 1.7 gig iso that i can not open with ultra iso. Although the program will burn to a dvd. Once the iso is burnt i can see the files on the dvd. I would like to open the image on the pc also.

So, what is the problem really?

Why not just mount the .iso image on a virtual drive (e.g. Daemon Tools) and then simply look at the files in My Computer/explorer?