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

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

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