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

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

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