In addition to adambyte's suggestion, you may also click on the .iso. Select File > Get Info. From the Opens with: pop-up menu, chose DiskImageMounter.mauve said:Whe I click on the file Toast pops up with this message:
Toast could not detect format of "blahblahblah.dfdfd.disk.1(VCDfromEOODO)sharelita.com.nrg"
Click Continue if you are certain that it is a valid disc image
the it says it cannot be used because it is not a valid DVD Video image.
I guess I should trash it.