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

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

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