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

x9j.ASX	Advanced Stream Redirector
x9j.DTS	Digital Theater Systems Audio File
x9j.GXF	General eXchange Format
x9j.M2V	MPEG-2 Video
x9j.M3U	MP3 Uniform Resource Locator
x9j.M4V	MPEG-4 Video File
x9j.MPEG1	MPEG-1 Video
x9j.MPEG2	MPEG-2 Video
x9j.MTS	AVCHD Video File
x9j.MXF	Material eXchange Format
x9j.OGM	Ogg Multimedia Container File
x9j.PLS	Playlist
x9j.BUP	DVD Information File
x9j.A52	Dolby Digital AC-3 Compressed Audio File
x9j.AAC	Advanced Audio Coding Compressed Audio File
x9j.B4S	Winamp 3+ Playlist
x9j.CUE	Cue Sheet
x9j.DIVX	DivX Movie
x9j.DV	Digital Video
x9j.FLV	Flash Video
x9j.M1V	MPEG-1 Video
x9j.M2TS	MPEG-2 Transport Stream Videos
x9j.MKV	Matroska Video Stream
x9j.MOV	Apple QuickTime Movie
x9j.MPEG4	MPEG-4 Video
x9j.OMA	OpenMG Audio File
x9j.SPX	Ogg Speex Audio File
x9j.TS	DVD Video
x9j.VLC	VLC Media Player Data
x9j.VOB	DVD Video Object
x9j.XSPF	XML Shareable Playlist Format
x9j.DAT	VCD Video
x9j.BIN	Binary DVD Video
x9j.IFO	DVD Information File
x9j.PART	Partially Downloaded File
x9j.3G2	3G Mobile Phone Video
x9j.AVI	Audio Video Interleave
x9j.MPEG	MPEG Video
x9j.MPG	MPEG Video
x9j.FLAC	Free Lossless Audio Codec Compressed Audio FIle
x9j.M4A	MPEG-4 Audio File
x9j.MP1	MPEG-1 Audio Layer I
x9j.OGG	Ogg Multimedia Container File
x9j.WAV	Waveform Audio
x9j.XM	Extended Module Audio File
x9j.3GP	3G Mobile Phone Video
x9j.SRT	DVD Subtitles File
x9j.WMV	Windows Media Video
x9j.AC3	Dolby Digital AC-3 Compressed Audio File
x9j.ASF	Advanced Systems Format Video
x9j.MOD	MOD Audio File
x9j.MP2	MPEG-1 Audio Layer II
x9j.MP3	MPEG-1 Audio Layer 3
x9j.MP4	MPEG-4 Part 14 Multimedia Container
x9j.WMA	Windows Media Audio File
x9j.MKA	Matroska Audio Stream
x9j.M4P	Protected AAC File

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