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

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

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