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

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

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