This article lists the multimedia file types that are supported by Windows Media Player 12. Additional file formats might be supported if you install new codecs pack in Windows.
Windows Media formats (.asf, .wma, .wmv, .wm)
Windows Media Metafiles (.asx, .wax, .wvx, .wmx, wpl)
Microsoft Digital Video Recording (.dvr-ms)
Windows Media Download Package (.wmd)
Audio Visual Interleave (.avi)
Moving Pictures Experts Group (.mpg, .mpeg, .m1v, .mp2, .mp3, .mpa, .mpe, .m3u)
Musical Instrument Digital Interface (.mid, .midi, .rmi)
Audio Interchange File Format (.aif, .aifc, .aiff)
Sun Microsystems and NeXT (.au, .snd)
Audio for Windows (.wav)
CD Audio Track (.cda)
Indeo Video Technology (.ivf)
Windows Media Player Skins (.wmz, .wms)
QuickTime Movie file (.mov)
MP4 Audio file (.m4a)
MP4 Video file (.mp4, .m4v, .mp4v, .3g2, .3gp2, .3gp, .3gpp)
Windows audio file (.aac, .adt, .adts)
MPEG-2 TS Video file (.m2ts)
Free Lossless Audio Codec (.flac)
Detailed information about supported file types
Windows Media formats (.asf, .wma, .wmv, .wm)
Windows Media Metafiles (.asx, .wax, .wvx, .wmx, .wpl)
Microsoft Digital Video Recording (.dvr-ms)
Windows Media Download Package (.wmd)
Audio Visual Interleave (.avi)
Moving Pictures Experts Group (.mpg, .mpeg, .m1v, .mp2, .mp3, .mpa, .mpe, .mpv2, .m3u)
Musical Instrument Digital Interface (.mid, .midi, .rmi)
Audio Interchange File Format ( .aif, .aifc, .aiff)
Sun Microsystems and NeXT (.au, .snd)
Audio for Windows (.wav)
CD Audio Track (.cda)
Indeo Video Technology (.ivf)
Windows Media Player Skins (.wmz, .wms)
QuickTime Movie file(.mov)
MP4 Audio file (.m4a)
MP4 Video file (.mp4, .m4v, .mp4v, .3g2, .3gp2, .3gp, .3gpp)
Windows audio file (.aac, .adt, .adts)
MPEG-2 TS Video file (.m2ts)