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

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

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