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

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

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