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

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

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