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

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

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