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

y2w.ASX	Advanced Stream Redirector
y2w.DTS	Digital Theater Systems Audio File
y2w.GXF	General eXchange Format
y2w.M2V	MPEG-2 Video
y2w.M3U	MP3 Uniform Resource Locator
y2w.M4V	MPEG-4 Video File
y2w.MPEG1	MPEG-1 Video
y2w.MPEG2	MPEG-2 Video
y2w.MTS	AVCHD Video File
y2w.MXF	Material eXchange Format
y2w.OGM	Ogg Multimedia Container File
y2w.PLS	Playlist
y2w.BUP	DVD Information File
y2w.A52	Dolby Digital AC-3 Compressed Audio File
y2w.AAC	Advanced Audio Coding Compressed Audio File
y2w.B4S	Winamp 3+ Playlist
y2w.CUE	Cue Sheet
y2w.DIVX	DivX Movie
y2w.DV	Digital Video
y2w.FLV	Flash Video
y2w.M1V	MPEG-1 Video
y2w.M2TS	MPEG-2 Transport Stream Videos
y2w.MKV	Matroska Video Stream
y2w.MOV	Apple QuickTime Movie
y2w.MPEG4	MPEG-4 Video
y2w.OMA	OpenMG Audio File
y2w.SPX	Ogg Speex Audio File
y2w.TS	DVD Video
y2w.VLC	VLC Media Player Data
y2w.VOB	DVD Video Object
y2w.XSPF	XML Shareable Playlist Format
y2w.DAT	VCD Video
y2w.BIN	Binary DVD Video
y2w.IFO	DVD Information File
y2w.PART	Partially Downloaded File
y2w.3G2	3G Mobile Phone Video
y2w.AVI	Audio Video Interleave
y2w.MPEG	MPEG Video
y2w.MPG	MPEG Video
y2w.FLAC	Free Lossless Audio Codec Compressed Audio FIle
y2w.M4A	MPEG-4 Audio File
y2w.MP1	MPEG-1 Audio Layer I
y2w.OGG	Ogg Multimedia Container File
y2w.WAV	Waveform Audio
y2w.XM	Extended Module Audio File
y2w.3GP	3G Mobile Phone Video
y2w.SRT	DVD Subtitles File
y2w.WMV	Windows Media Video
y2w.AC3	Dolby Digital AC-3 Compressed Audio File
y2w.ASF	Advanced Systems Format Video
y2w.MOD	MOD Audio File
y2w.MP2	MPEG-1 Audio Layer II
y2w.MP3	MPEG-1 Audio Layer 3
y2w.MP4	MPEG-4 Part 14 Multimedia Container
y2w.WMA	Windows Media Audio File
y2w.MKA	Matroska Audio Stream
y2w.M4P	Protected AAC File

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