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

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

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