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

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

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