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 songbird

fk4.FLAC	Free Lossless Audio Codec Compressed Audio FIle
fk4.WAV	Waveform Audio
fk4.3GP	3G Mobile Phone Video
fk4.M4A	MPEG-4 Audio File
fk4.APE	Monkey's Audio Compressed Audio File
fk4.ASF	Advanced Systems Format Video
fk4.AIF	Audio Interchange Format File
fk4.MID	MIDI Audio Sequence
fk4.OGG	Ogg Multimedia Container File
fk4.MP4	MPEG-4 Part 14 Multimedia Container
fk4.AC3	Dolby Digital AC-3 Compressed Audio File
fk4.WV	WavPack Compressed Audio File
fk4.MP1	MPEG-1 Audio Layer I
fk4.MKA	Matroska Audio Stream
fk4.MOD	MOD Audio File
fk4.SND	Sun / NeXT Audio File
fk4.AU	Sun / NeXT Audio File
fk4.MP3	MPEG-1 Audio Layer 3
fk4.M4P	Protected AAC File
fk4.MP2	MPEG-1 Audio Layer II
fk4.WMA	Windows Media Audio File
fk4.XM	Extended Module Audio File

File extensions that can be opened by vlc-media-player

fk4.ASX	Advanced Stream Redirector
fk4.DTS	Digital Theater Systems Audio File
fk4.GXF	General eXchange Format
fk4.M2V	MPEG-2 Video
fk4.M3U	MP3 Uniform Resource Locator
fk4.M4V	MPEG-4 Video File
fk4.MPEG1	MPEG-1 Video
fk4.MPEG2	MPEG-2 Video
fk4.MTS	AVCHD Video File
fk4.MXF	Material eXchange Format
fk4.OGM	Ogg Multimedia Container File
fk4.PLS	Playlist
fk4.BUP	DVD Information File
fk4.A52	Dolby Digital AC-3 Compressed Audio File
fk4.AAC	Advanced Audio Coding Compressed Audio File
fk4.B4S	Winamp 3+ Playlist
fk4.CUE	Cue Sheet
fk4.DIVX	DivX Movie
fk4.DV	Digital Video
fk4.FLV	Flash Video
fk4.M1V	MPEG-1 Video
fk4.M2TS	MPEG-2 Transport Stream Videos
fk4.MKV	Matroska Video Stream
fk4.MOV	Apple QuickTime Movie
fk4.MPEG4	MPEG-4 Video
fk4.OMA	OpenMG Audio File
fk4.SPX	Ogg Speex Audio File
fk4.TS	DVD Video
fk4.VLC	VLC Media Player Data
fk4.VOB	DVD Video Object
fk4.XSPF	XML Shareable Playlist Format
fk4.DAT	VCD Video
fk4.BIN	Binary DVD Video
fk4.IFO	DVD Information File
fk4.PART	Partially Downloaded File
fk4.3G2	3G Mobile Phone Video
fk4.AVI	Audio Video Interleave
fk4.MPEG	MPEG Video
fk4.MPG	MPEG Video
fk4.FLAC	Free Lossless Audio Codec Compressed Audio FIle
fk4.M4A	MPEG-4 Audio File
fk4.MP1	MPEG-1 Audio Layer I
fk4.OGG	Ogg Multimedia Container File
fk4.WAV	Waveform Audio
fk4.XM	Extended Module Audio File
fk4.3GP	3G Mobile Phone Video
fk4.SRT	DVD Subtitles File
fk4.WMV	Windows Media Video
fk4.AC3	Dolby Digital AC-3 Compressed Audio File
fk4.ASF	Advanced Systems Format Video
fk4.MOD	MOD Audio File
fk4.MP2	MPEG-1 Audio Layer II
fk4.MP3	MPEG-1 Audio Layer 3
fk4.MP4	MPEG-4 Part 14 Multimedia Container
fk4.WMA	Windows Media Audio File
fk4.MKA	Matroska Audio Stream
fk4.M4P	Protected AAC File

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