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

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

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