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

mk4.ASX	Advanced Stream Redirector
mk4.DTS	Digital Theater Systems Audio File
mk4.GXF	General eXchange Format
mk4.M2V	MPEG-2 Video
mk4.M3U	MP3 Uniform Resource Locator
mk4.M4V	MPEG-4 Video File
mk4.MPEG1	MPEG-1 Video
mk4.MPEG2	MPEG-2 Video
mk4.MTS	AVCHD Video File
mk4.MXF	Material eXchange Format
mk4.OGM	Ogg Multimedia Container File
mk4.PLS	Playlist
mk4.BUP	DVD Information File
mk4.A52	Dolby Digital AC-3 Compressed Audio File
mk4.AAC	Advanced Audio Coding Compressed Audio File
mk4.B4S	Winamp 3+ Playlist
mk4.CUE	Cue Sheet
mk4.DIVX	DivX Movie
mk4.DV	Digital Video
mk4.FLV	Flash Video
mk4.M1V	MPEG-1 Video
mk4.M2TS	MPEG-2 Transport Stream Videos
mk4.MKV	Matroska Video Stream
mk4.MOV	Apple QuickTime Movie
mk4.MPEG4	MPEG-4 Video
mk4.OMA	OpenMG Audio File
mk4.SPX	Ogg Speex Audio File
mk4.TS	DVD Video
mk4.VLC	VLC Media Player Data
mk4.VOB	DVD Video Object
mk4.XSPF	XML Shareable Playlist Format
mk4.DAT	VCD Video
mk4.BIN	Binary DVD Video
mk4.IFO	DVD Information File
mk4.PART	Partially Downloaded File
mk4.3G2	3G Mobile Phone Video
mk4.AVI	Audio Video Interleave
mk4.MPEG	MPEG Video
mk4.MPG	MPEG Video
mk4.FLAC	Free Lossless Audio Codec Compressed Audio FIle
mk4.M4A	MPEG-4 Audio File
mk4.MP1	MPEG-1 Audio Layer I
mk4.OGG	Ogg Multimedia Container File
mk4.WAV	Waveform Audio
mk4.XM	Extended Module Audio File
mk4.3GP	3G Mobile Phone Video
mk4.SRT	DVD Subtitles File
mk4.WMV	Windows Media Video
mk4.AC3	Dolby Digital AC-3 Compressed Audio File
mk4.ASF	Advanced Systems Format Video
mk4.MOD	MOD Audio File
mk4.MP2	MPEG-1 Audio Layer II
mk4.MP3	MPEG-1 Audio Layer 3
mk4.MP4	MPEG-4 Part 14 Multimedia Container
mk4.WMA	Windows Media Audio File
mk4.MKA	Matroska Audio Stream
mk4.M4P	Protected AAC File

amk4   bmk4   cmk4   dmk4   emk4   fmk4   gmk4   hmk4   imk4   jmk4   kmk4   lmk4   mmk4   nmk4   omk4   pmk4   qmk4   rmk4   smk4   tmk4   umk4   vmk4   wmk4   xmk4   ymk4   zmk4   0mk4   1mk4   2mk4   3mk4   4mk4   5mk4   6mk4   7mk4   8mk4   9mk4