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

kr4.ASX	Advanced Stream Redirector
kr4.DTS	Digital Theater Systems Audio File
kr4.GXF	General eXchange Format
kr4.M2V	MPEG-2 Video
kr4.M3U	MP3 Uniform Resource Locator
kr4.M4V	MPEG-4 Video File
kr4.MPEG1	MPEG-1 Video
kr4.MPEG2	MPEG-2 Video
kr4.MTS	AVCHD Video File
kr4.MXF	Material eXchange Format
kr4.OGM	Ogg Multimedia Container File
kr4.PLS	Playlist
kr4.BUP	DVD Information File
kr4.A52	Dolby Digital AC-3 Compressed Audio File
kr4.AAC	Advanced Audio Coding Compressed Audio File
kr4.B4S	Winamp 3+ Playlist
kr4.CUE	Cue Sheet
kr4.DIVX	DivX Movie
kr4.DV	Digital Video
kr4.FLV	Flash Video
kr4.M1V	MPEG-1 Video
kr4.M2TS	MPEG-2 Transport Stream Videos
kr4.MKV	Matroska Video Stream
kr4.MOV	Apple QuickTime Movie
kr4.MPEG4	MPEG-4 Video
kr4.OMA	OpenMG Audio File
kr4.SPX	Ogg Speex Audio File
kr4.TS	DVD Video
kr4.VLC	VLC Media Player Data
kr4.VOB	DVD Video Object
kr4.XSPF	XML Shareable Playlist Format
kr4.DAT	VCD Video
kr4.BIN	Binary DVD Video
kr4.IFO	DVD Information File
kr4.PART	Partially Downloaded File
kr4.3G2	3G Mobile Phone Video
kr4.AVI	Audio Video Interleave
kr4.MPEG	MPEG Video
kr4.MPG	MPEG Video
kr4.FLAC	Free Lossless Audio Codec Compressed Audio FIle
kr4.M4A	MPEG-4 Audio File
kr4.MP1	MPEG-1 Audio Layer I
kr4.OGG	Ogg Multimedia Container File
kr4.WAV	Waveform Audio
kr4.XM	Extended Module Audio File
kr4.3GP	3G Mobile Phone Video
kr4.SRT	DVD Subtitles File
kr4.WMV	Windows Media Video
kr4.AC3	Dolby Digital AC-3 Compressed Audio File
kr4.ASF	Advanced Systems Format Video
kr4.MOD	MOD Audio File
kr4.MP2	MPEG-1 Audio Layer II
kr4.MP3	MPEG-1 Audio Layer 3
kr4.MP4	MPEG-4 Part 14 Multimedia Container
kr4.WMA	Windows Media Audio File
kr4.MKA	Matroska Audio Stream
kr4.M4P	Protected AAC File

akr4   bkr4   ckr4   dkr4   ekr4   fkr4   gkr4   hkr4   ikr4   jkr4   kkr4   lkr4   mkr4   nkr4   okr4   pkr4   qkr4   rkr4   skr4   tkr4   ukr4   vkr4   wkr4   xkr4   ykr4   zkr4   0kr4   1kr4   2kr4   3kr4   4kr4   5kr4   6kr4   7kr4   8kr4   9kr4