Convert DAV to AVI, MP4, MPEG, WMV, MP3, and WAV to Play DAV Files with DAV Converter and DAV Player http Powerful. Convert Wmv To Mp3 With Windows Media Player' title='Convert Wmv To Mp3 With Windows Media Player' />General Video category as the output format. Step 3 Start MP4 to WMP popular format conversion. When all done, click big Convert button to start and finish MP4 to WMP format conversion with high quality and fast speed. Tips Before conversion, click Trim button on the interface of the program to open Video Edit Window to edit MP4 file. There you can trim, crop, adjust the brightnesscontrast saturation of the image, and add text or picture watermark, effect and subtitle to the video, etc Click Setting. Please click Advanced to set the bitrate of the video and audio, adjust the volume and change the channel of the audio, etc. Right click the selected files to Merge Selected into One from the context menu. More about Windows Media Player and MP4. Windows Media Player WMP, the built in media player of Windows system, uses a technology called Direct. Show to use any installed Direct. Show filter, include splitter and codecencoder and decoder, to split media file into video and audio stream, and decode them into video image and audio waveform respectively. Windows system only comes with some filter that support WMV, ASF, AVI, MPG, MP3, WAV, etc, and doesnt support MP4. MP4MPEG 4 file format and its associated audio and video codec, MPEG 4, H. AVC, AAC is issued by ISO MPEG organization. As universal standards, they have been widely accepted by most popular players. Why Windows doesnt support it Because MP4, based on Apples MOV format, is not a free format. Apple holds some patents on it. Maybe Microsoft wont pay money to Apple, so it doesnt support MP4 until today.