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

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

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