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

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

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