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

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

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