I have installed "Media Player Classic" + "ffdshow Tryout" to play FLV files. It works perfectly. Note that it is "ffdshow Tryout", not ffdshow. "ffdshow Tryout" allows me to select which program to use the ffdshow codec. I limit the use of "ffdshow Tryout" to "Media Player Classic". It is cool, so that I do not have to mess up the other music / video players.