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

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

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