video player that plays .flv to .avi to mkv all filetypes

is there something out there
Answer #1
VLC Media player, free, google it. plays anything.
Answer #2
thank you vander this is the greatest codec player…ive tried them all and the past 5 years VLC plays anything i throw at it
Answer #3
VLC also gets my vote.
Answer #4
K-Lite Mega Codec Player …. including .rmvb files
Answer #5
The KMPlayer v.3.0.0.1438
http://www.filehippo.com/download_kmplayer/
Answer #6
VLC Media player and the best part its free.