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

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

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