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

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

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