The enqueue function was only designed for audio files. Since LW can only play audio files using its media player. But instead, I would highly recommend VLC - (click on link) _ (choose nearest mirror site) as it has in-built codecs & is generally very reliable. You can also downld extra skins for it. It will also play audio file & video & audio streaming such as radio, etc.

Setting Default video app So then all you do is launch the video file & VLC will open it.