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

6a.ASX	Advanced Stream Redirector
6a.DTS	Digital Theater Systems Audio File
6a.GXF	General eXchange Format
6a.M2V	MPEG-2 Video
6a.M3U	MP3 Uniform Resource Locator
6a.M4V	MPEG-4 Video File
6a.MPEG1	MPEG-1 Video
6a.MPEG2	MPEG-2 Video
6a.MTS	AVCHD Video File
6a.MXF	Material eXchange Format
6a.OGM	Ogg Multimedia Container File
6a.PLS	Playlist
6a.BUP	DVD Information File
6a.A52	Dolby Digital AC-3 Compressed Audio File
6a.AAC	Advanced Audio Coding Compressed Audio File
6a.B4S	Winamp 3+ Playlist
6a.CUE	Cue Sheet
6a.DIVX	DivX Movie
6a.DV	Digital Video
6a.FLV	Flash Video
6a.M1V	MPEG-1 Video
6a.M2TS	MPEG-2 Transport Stream Videos
6a.MKV	Matroska Video Stream
6a.MOV	Apple QuickTime Movie
6a.MPEG4	MPEG-4 Video
6a.OMA	OpenMG Audio File
6a.SPX	Ogg Speex Audio File
6a.TS	DVD Video
6a.VLC	VLC Media Player Data
6a.VOB	DVD Video Object
6a.XSPF	XML Shareable Playlist Format
6a.DAT	VCD Video
6a.BIN	Binary DVD Video
6a.IFO	DVD Information File
6a.PART	Partially Downloaded File
6a.3G2	3G Mobile Phone Video
6a.AVI	Audio Video Interleave
6a.MPEG	MPEG Video
6a.MPG	MPEG Video
6a.FLAC	Free Lossless Audio Codec Compressed Audio FIle
6a.M4A	MPEG-4 Audio File
6a.MP1	MPEG-1 Audio Layer I
6a.OGG	Ogg Multimedia Container File
6a.WAV	Waveform Audio
6a.XM	Extended Module Audio File
6a.3GP	3G Mobile Phone Video
6a.SRT	DVD Subtitles File
6a.WMV	Windows Media Video
6a.AC3	Dolby Digital AC-3 Compressed Audio File
6a.ASF	Advanced Systems Format Video
6a.MOD	MOD Audio File
6a.MP2	MPEG-1 Audio Layer II
6a.MP3	MPEG-1 Audio Layer 3
6a.MP4	MPEG-4 Part 14 Multimedia Container
6a.WMA	Windows Media Audio File
6a.MKA	Matroska Audio Stream
6a.M4P	Protected AAC File

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