Have you downloaded a video file in ISO format and can’t play it? Maybe you tried to convert it or tried to use Real Player, visit Itunes, stomach Quickplay and Media Player without success. Here is the solution.
I found that if you start the DVD-player on your Mac and just open the ISO-file you can play it right away with no problems. Let me know if it worked for you.
I also tried to convert the ISO-file to MKV and MPEG4 using the software Handbrake. It too worked fine.