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

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

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