What tools are you usually use for reading and mounting ISO image file? There are many alternatives, two of them are as following, WinISO and PowerISO. These are actually not completely free tools. However, the good thing is, their free offers are more than enough if the need is just for reading and mounting the ISO image.
Other than ISO file, those tools also support other types of image file, such as Cue sheets, Nero Burning, Alcohol 120%, CloneCD, Virtual Drive Images, Mac Images, so on.