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

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

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