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

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

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