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

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

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