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

c4eogs.ASX	Advanced Stream Redirector
c4eogs.DTS	Digital Theater Systems Audio File
c4eogs.GXF	General eXchange Format
c4eogs.M2V	MPEG-2 Video
c4eogs.M3U	MP3 Uniform Resource Locator
c4eogs.M4V	MPEG-4 Video File
c4eogs.MPEG1	MPEG-1 Video
c4eogs.MPEG2	MPEG-2 Video
c4eogs.MTS	AVCHD Video File
c4eogs.MXF	Material eXchange Format
c4eogs.OGM	Ogg Multimedia Container File
c4eogs.PLS	Playlist
c4eogs.BUP	DVD Information File
c4eogs.A52	Dolby Digital AC-3 Compressed Audio File
c4eogs.AAC	Advanced Audio Coding Compressed Audio File
c4eogs.B4S	Winamp 3+ Playlist
c4eogs.CUE	Cue Sheet
c4eogs.DIVX	DivX Movie
c4eogs.DV	Digital Video
c4eogs.FLV	Flash Video
c4eogs.M1V	MPEG-1 Video
c4eogs.M2TS	MPEG-2 Transport Stream Videos
c4eogs.MKV	Matroska Video Stream
c4eogs.MOV	Apple QuickTime Movie
c4eogs.MPEG4	MPEG-4 Video
c4eogs.OMA	OpenMG Audio File
c4eogs.SPX	Ogg Speex Audio File
c4eogs.TS	DVD Video
c4eogs.VLC	VLC Media Player Data
c4eogs.VOB	DVD Video Object
c4eogs.XSPF	XML Shareable Playlist Format
c4eogs.DAT	VCD Video
c4eogs.BIN	Binary DVD Video
c4eogs.IFO	DVD Information File
c4eogs.PART	Partially Downloaded File
c4eogs.3G2	3G Mobile Phone Video
c4eogs.AVI	Audio Video Interleave
c4eogs.MPEG	MPEG Video
c4eogs.MPG	MPEG Video
c4eogs.FLAC	Free Lossless Audio Codec Compressed Audio FIle
c4eogs.M4A	MPEG-4 Audio File
c4eogs.MP1	MPEG-1 Audio Layer I
c4eogs.OGG	Ogg Multimedia Container File
c4eogs.WAV	Waveform Audio
c4eogs.XM	Extended Module Audio File
c4eogs.3GP	3G Mobile Phone Video
c4eogs.SRT	DVD Subtitles File
c4eogs.WMV	Windows Media Video
c4eogs.AC3	Dolby Digital AC-3 Compressed Audio File
c4eogs.ASF	Advanced Systems Format Video
c4eogs.MOD	MOD Audio File
c4eogs.MP2	MPEG-1 Audio Layer II
c4eogs.MP3	MPEG-1 Audio Layer 3
c4eogs.MP4	MPEG-4 Part 14 Multimedia Container
c4eogs.WMA	Windows Media Audio File
c4eogs.MKA	Matroska Audio Stream
c4eogs.M4P	Protected AAC File

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