windows media does not support all extensions. Below are the examples. if you have the right format and still you are not able to play then best option is to upgrade or reinstall media player.
Windows Media Player 6.0
loadTOCNode(2, 'moreinformation');
- Windows Media formats
File name extensions: .asf, .asx, .avi, .wav, .wma, .wax, .wm, .wmv, .wvx
- RealAudio and RealVideo (version 4.0 or earlier)
File name extensions: .ra, .ram, .rm, .rmm
- Moving Pictures Experts Group (MPEG)
File name extensions: .mpg, .mpeg, .m1v, .mp2, .mpa, .mpe
Note MPEG 2 requires third-party software or hardware decoders.
- Musical Instrument Digital Interface (MIDI)
File name extensions: .mid, .rmi
- Apple QuickTime (version 2.0 or earlier)
File name extensions: .mov
- Macintosh AIFF Resource
File name extensions: .aif, .aifc, .aiff
- Intel Video File
File name extensions: .ivf
- UNIX
File name extensions: .au, .snd
Windows Media Player 6.1, 6.2, 6.4, 7, 7.1, Windows Media Player for Windows XP, and Windows Media Player 9 Series
loadTOCNode(2, 'moreinformation');
- Windows Media formats
File name extensions: .asf, .asx, .avi, .wav, .wax, .wma, .wm
- Audio Visual Interleave
File name extension: .avi
- Moving Pictures Experts Group (MPEG)
File name extensions: m3u, mp2v, .mpg, .mpeg, .m1v, .mp2, .mp3, .m3u, .mpa, .mpe, mpv2
Note MPEG 2 requires third-party software or hardware decoders.
- DVD Video
File name extension: .vob
Note DVD playback requires third-party software or hardware decoders and is supported only in Windows XP.
- Musical Instrument Digital Interface (MIDI)
File name extensions: .mid, midi, .rmi
- Apple Macintosh AIFF Resource
File name extensions: .aif, .aifc, .aiff
- Sun Microsystems and NeXT
File name extensions: .au, .snd
- Intel Video File
File name extensions: .ivf
Note Intel Video File support requires the Intel Video 5.x codec.
- Windows Media Player Skins
File name extensions: .wmz, .wms
- QuickTime Content
File name extensions: .avi, .mov, .qt
Note Windows Media Player can play back older forms of the QuickTime format only. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/316992/EN-US/ ) Windows Media Player Multimedia File Formats
- Algebraic-Code-Excited Linear Prediction
- UNIX
File name extensions: .au, .snd
- Macromedia Flash
File name extension: .swf
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