Trouble loading video to mp4 player

Question

I have a Naxa Electronics ''NX-142'' it is not listed in their catalog but the same model with less memory is. I have the 4 GB version. I have already converted the video to amv format. I can load music files from windows media player but that is it. The WMP does not recognize the amv format so I cannot sync the video from there. I had been right clicking on the amv file and using the send to command but the option, ''send to removable device'', is not there anymore. Windows is recognizing the player as an ''Actions MTP Device 000001'' and before it was just recognized as removable storage and it work fine with the send to command.