I do not need a solution (just sharing information)
I had trouble creating a disc image when downloading backup exec 2012 from the fileconect... website.
I downloaded the three files as indicated. I clicked on the one called ".cmd" This created the single zip file.
Then the part that seems to be missing from the instructions, UNZIP THE NEWLY CREATED FILE!
Then burn it to a DVD. Hopefully this saves someone some time and frustration.