i used AVS Video Converter with an MP3+G input (a pair of .MP3 and .CDG) to be converted to MP4 format. The output came out
with .M4V format extension. I played it in my PC and played just fine. But why .M4V extension? The hardware I will be playing this in accepts
an .MP4 extension, .MP3, MPEG, etc... no mention about .M4V. I tried renaming the extension to .MP4 but got a warning message that renaming
the extension might not make the file work.