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

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

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