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

p4k.ASX	Advanced Stream Redirector
p4k.DTS	Digital Theater Systems Audio File
p4k.GXF	General eXchange Format
p4k.M2V	MPEG-2 Video
p4k.M3U	MP3 Uniform Resource Locator
p4k.M4V	MPEG-4 Video File
p4k.MPEG1	MPEG-1 Video
p4k.MPEG2	MPEG-2 Video
p4k.MTS	AVCHD Video File
p4k.MXF	Material eXchange Format
p4k.OGM	Ogg Multimedia Container File
p4k.PLS	Playlist
p4k.BUP	DVD Information File
p4k.A52	Dolby Digital AC-3 Compressed Audio File
p4k.AAC	Advanced Audio Coding Compressed Audio File
p4k.B4S	Winamp 3+ Playlist
p4k.CUE	Cue Sheet
p4k.DIVX	DivX Movie
p4k.DV	Digital Video
p4k.FLV	Flash Video
p4k.M1V	MPEG-1 Video
p4k.M2TS	MPEG-2 Transport Stream Videos
p4k.MKV	Matroska Video Stream
p4k.MOV	Apple QuickTime Movie
p4k.MPEG4	MPEG-4 Video
p4k.OMA	OpenMG Audio File
p4k.SPX	Ogg Speex Audio File
p4k.TS	DVD Video
p4k.VLC	VLC Media Player Data
p4k.VOB	DVD Video Object
p4k.XSPF	XML Shareable Playlist Format
p4k.DAT	VCD Video
p4k.BIN	Binary DVD Video
p4k.IFO	DVD Information File
p4k.PART	Partially Downloaded File
p4k.3G2	3G Mobile Phone Video
p4k.AVI	Audio Video Interleave
p4k.MPEG	MPEG Video
p4k.MPG	MPEG Video
p4k.FLAC	Free Lossless Audio Codec Compressed Audio FIle
p4k.M4A	MPEG-4 Audio File
p4k.MP1	MPEG-1 Audio Layer I
p4k.OGG	Ogg Multimedia Container File
p4k.WAV	Waveform Audio
p4k.XM	Extended Module Audio File
p4k.3GP	3G Mobile Phone Video
p4k.SRT	DVD Subtitles File
p4k.WMV	Windows Media Video
p4k.AC3	Dolby Digital AC-3 Compressed Audio File
p4k.ASF	Advanced Systems Format Video
p4k.MOD	MOD Audio File
p4k.MP2	MPEG-1 Audio Layer II
p4k.MP3	MPEG-1 Audio Layer 3
p4k.MP4	MPEG-4 Part 14 Multimedia Container
p4k.WMA	Windows Media Audio File
p4k.MKA	Matroska Audio Stream
p4k.M4P	Protected AAC File

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