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

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

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