If you are unable to open an MP4 file on our media player, try changing the video format. There are many good video converters available on the internet that can help you convert your MP4 to MP3, AVI, ...

Reader Jon Nunes has old movies and a new operating system that don’t see eye to eye. He writes: I have a lot of old .avi movies from the days when I was using a Windows PC. I’d like to play them on ...

.Mov the quicktime format. You may need to use quicktime pro to convert it, as I don't think plain old quicktime has the same editing capabilities.