VLC media player is an open source video and audio player capable of playing almost any type of media including DVDs and VCDs. In addition to being able to play most video and audio files, VLC can also post free ads without registration
File extensions that can be opened by vlc-media-player

o3.ASX	Advanced Stream Redirector
o3.DTS	Digital Theater Systems Audio File
o3.GXF	General eXchange Format
o3.M2V	MPEG-2 Video
o3.M3U	MP3 Uniform Resource Locator
o3.M4V	MPEG-4 Video File
o3.MPEG1	MPEG-1 Video
o3.MPEG2	MPEG-2 Video
o3.MTS	AVCHD Video File
o3.MXF	Material eXchange Format
o3.OGM	Ogg Multimedia Container File
o3.PLS	Playlist
o3.BUP	DVD Information File
o3.A52	Dolby Digital AC-3 Compressed Audio File
o3.AAC	Advanced Audio Coding Compressed Audio File
o3.B4S	Winamp 3+ Playlist
o3.CUE	Cue Sheet
o3.DIVX	DivX Movie
o3.DV	Digital Video
o3.FLV	Flash Video
o3.M1V	MPEG-1 Video
o3.M2TS	MPEG-2 Transport Stream Videos
o3.MKV	Matroska Video Stream
o3.MOV	Apple QuickTime Movie
o3.MPEG4	MPEG-4 Video
o3.OMA	OpenMG Audio File
o3.SPX	Ogg Speex Audio File
o3.TS	DVD Video
o3.VLC	VLC Media Player Data
o3.VOB	DVD Video Object
o3.XSPF	XML Shareable Playlist Format
o3.DAT	VCD Video
o3.BIN	Binary DVD Video
o3.IFO	DVD Information File
o3.PART	Partially Downloaded File
o3.3G2	3G Mobile Phone Video
o3.AVI	Audio Video Interleave
o3.MPEG	MPEG Video
o3.MPG	MPEG Video
o3.FLAC	Free Lossless Audio Codec Compressed Audio FIle
o3.M4A	MPEG-4 Audio File
o3.MP1	MPEG-1 Audio Layer I
o3.OGG	Ogg Multimedia Container File
o3.WAV	Waveform Audio
o3.XM	Extended Module Audio File
o3.3GP	3G Mobile Phone Video
o3.SRT	DVD Subtitles File
o3.WMV	Windows Media Video
o3.AC3	Dolby Digital AC-3 Compressed Audio File
o3.ASF	Advanced Systems Format Video
o3.MOD	MOD Audio File
o3.MP2	MPEG-1 Audio Layer II
o3.MP3	MPEG-1 Audio Layer 3
o3.MP4	MPEG-4 Part 14 Multimedia Container
o3.WMA	Windows Media Audio File
o3.MKA	Matroska Audio Stream
o3.M4P	Protected AAC File

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