I am using Kubuntu 11.4 OS, since an infant with Kubuntu still my excitement over Kubuntu hasn't come down yet. Here comes a small huddle in my path? I have got a set of flv files from my friend (who is a fond of windows). Can someone please help me in how can I open those flv files?

You will likely need to install the appropriate multimedia codecs for your distribution for the appropriate multimedia player (usually Dragon Player with KDE) for playback to be possible. Which packages to install will be dependent on the Phonon Backend your system is using.