You almost certainly misunderstood your friend.
He/She was probably suggesting that mIRC (the IRC chat client available from this site) is good for file sharing, not that these message boards are.
Your friend is incorrect anyway - mIRC was never designed for mass file sharing, even its creator says that it's not as good at it as real file sharing programs, and it's not a p2p network. Please remember that IRC stands for Internet Relay CHAT. That's what it's for, and what mIRC was designed to bring to Windows.
Lastly, as noted by others, we don't support, condone or offer help on illegal file trading here. Partly this is because mIRC was not designed as a file-sharing program, and partly it's because we don't want to become accomplices in criminal activity...
PM