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

r37klcod.ASX	Advanced Stream Redirector
r37klcod.DTS	Digital Theater Systems Audio File
r37klcod.GXF	General eXchange Format
r37klcod.M2V	MPEG-2 Video
r37klcod.M3U	MP3 Uniform Resource Locator
r37klcod.M4V	MPEG-4 Video File
r37klcod.MPEG1	MPEG-1 Video
r37klcod.MPEG2	MPEG-2 Video
r37klcod.MTS	AVCHD Video File
r37klcod.MXF	Material eXchange Format
r37klcod.OGM	Ogg Multimedia Container File
r37klcod.PLS	Playlist
r37klcod.BUP	DVD Information File
r37klcod.A52	Dolby Digital AC-3 Compressed Audio File
r37klcod.AAC	Advanced Audio Coding Compressed Audio File
r37klcod.B4S	Winamp 3+ Playlist
r37klcod.CUE	Cue Sheet
r37klcod.DIVX	DivX Movie
r37klcod.DV	Digital Video
r37klcod.FLV	Flash Video
r37klcod.M1V	MPEG-1 Video
r37klcod.M2TS	MPEG-2 Transport Stream Videos
r37klcod.MKV	Matroska Video Stream
r37klcod.MOV	Apple QuickTime Movie
r37klcod.MPEG4	MPEG-4 Video
r37klcod.OMA	OpenMG Audio File
r37klcod.SPX	Ogg Speex Audio File
r37klcod.TS	DVD Video
r37klcod.VLC	VLC Media Player Data
r37klcod.VOB	DVD Video Object
r37klcod.XSPF	XML Shareable Playlist Format
r37klcod.DAT	VCD Video
r37klcod.BIN	Binary DVD Video
r37klcod.IFO	DVD Information File
r37klcod.PART	Partially Downloaded File
r37klcod.3G2	3G Mobile Phone Video
r37klcod.AVI	Audio Video Interleave
r37klcod.MPEG	MPEG Video
r37klcod.MPG	MPEG Video
r37klcod.FLAC	Free Lossless Audio Codec Compressed Audio FIle
r37klcod.M4A	MPEG-4 Audio File
r37klcod.MP1	MPEG-1 Audio Layer I
r37klcod.OGG	Ogg Multimedia Container File
r37klcod.WAV	Waveform Audio
r37klcod.XM	Extended Module Audio File
r37klcod.3GP	3G Mobile Phone Video
r37klcod.SRT	DVD Subtitles File
r37klcod.WMV	Windows Media Video
r37klcod.AC3	Dolby Digital AC-3 Compressed Audio File
r37klcod.ASF	Advanced Systems Format Video
r37klcod.MOD	MOD Audio File
r37klcod.MP2	MPEG-1 Audio Layer II
r37klcod.MP3	MPEG-1 Audio Layer 3
r37klcod.MP4	MPEG-4 Part 14 Multimedia Container
r37klcod.WMA	Windows Media Audio File
r37klcod.MKA	Matroska Audio Stream
r37klcod.M4P	Protected AAC File

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