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

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

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