I have a question about ISO and CUE files on Daemon Tools

I downloaded a few games.. two ISO. and one CUE. files.... i dont know why the CUE one it says its not acessable. =(.. and the ISO just doesnt load... whats the problem? thankyou for taking your time to considerate

Be more specific.If you have a cue have to be in pair with a bin also an image file.Doesn’t load on what?Dvd Shrink and Daemon tools or Alcohol 120% work with image file.