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

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

apo   bpo   cpo   dpo   epo   fpo   gpo   hpo   ipo   jpo   kpo   lpo   mpo   npo   opo   ppo   qpo   rpo   spo   tpo   upo   vpo   wpo   xpo   ypo   zpo   0po   1po   2po   3po   4po   5po   6po   7po   8po   9po