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

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

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