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

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

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