.rar and .iso files

I had a friend send me some archived files (.rar) files with extracted fine (using SuperNZB) into .iso files. I tried to burn them onto DVDs, which occurs, but I think they are supposed to be installer files, but it doesn’t work out that way. All I get are four folders labeled with the application files.

Help! I am at a loss and my friend went on an extended vacation and can’t reach him. Any ideas?