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

k9.ASX	Advanced Stream Redirector
k9.DTS	Digital Theater Systems Audio File
k9.GXF	General eXchange Format
k9.M2V	MPEG-2 Video
k9.M3U	MP3 Uniform Resource Locator
k9.M4V	MPEG-4 Video File
k9.MPEG1	MPEG-1 Video
k9.MPEG2	MPEG-2 Video
k9.MTS	AVCHD Video File
k9.MXF	Material eXchange Format
k9.OGM	Ogg Multimedia Container File
k9.PLS	Playlist
k9.BUP	DVD Information File
k9.A52	Dolby Digital AC-3 Compressed Audio File
k9.AAC	Advanced Audio Coding Compressed Audio File
k9.B4S	Winamp 3+ Playlist
k9.CUE	Cue Sheet
k9.DIVX	DivX Movie
k9.DV	Digital Video
k9.FLV	Flash Video
k9.M1V	MPEG-1 Video
k9.M2TS	MPEG-2 Transport Stream Videos
k9.MKV	Matroska Video Stream
k9.MOV	Apple QuickTime Movie
k9.MPEG4	MPEG-4 Video
k9.OMA	OpenMG Audio File
k9.SPX	Ogg Speex Audio File
k9.TS	DVD Video
k9.VLC	VLC Media Player Data
k9.VOB	DVD Video Object
k9.XSPF	XML Shareable Playlist Format
k9.DAT	VCD Video
k9.BIN	Binary DVD Video
k9.IFO	DVD Information File
k9.PART	Partially Downloaded File
k9.3G2	3G Mobile Phone Video
k9.AVI	Audio Video Interleave
k9.MPEG	MPEG Video
k9.MPG	MPEG Video
k9.FLAC	Free Lossless Audio Codec Compressed Audio FIle
k9.M4A	MPEG-4 Audio File
k9.MP1	MPEG-1 Audio Layer I
k9.OGG	Ogg Multimedia Container File
k9.WAV	Waveform Audio
k9.XM	Extended Module Audio File
k9.3GP	3G Mobile Phone Video
k9.SRT	DVD Subtitles File
k9.WMV	Windows Media Video
k9.AC3	Dolby Digital AC-3 Compressed Audio File
k9.ASF	Advanced Systems Format Video
k9.MOD	MOD Audio File
k9.MP2	MPEG-1 Audio Layer II
k9.MP3	MPEG-1 Audio Layer 3
k9.MP4	MPEG-4 Part 14 Multimedia Container
k9.WMA	Windows Media Audio File
k9.MKA	Matroska Audio Stream
k9.M4P	Protected AAC File

ak9   bk9   ck9   dk9   ek9   fk9   gk9   hk9   ik9   jk9   kk9   lk9   mk9   nk9   ok9   pk9   qk9   rk9   sk9   tk9   uk9   vk9   wk9   xk9   yk9   zk9   0k9   1k9   2k9   3k9   4k9   5k9   6k9   7k9   8k9   9k9