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, ...

Although Windows Media Video (WMV) files are great, it is more common to use the MPEG4 (MP4) format. This means that you might need to convert your WMV files to MP4 fairly often. Fortunately, there’s ...

If you can play the file in windows media player (ie have the right filters installed) then Windows Movie Maker should be able to convert it to wmv. The output options are pretty basic, but it should ...