[*] mIRC is designed to use IRC networks that are themselves designed just to let people type messages to each other in real time. No voice, no video, no p2p. If this is too dull for you, you need to find something else. Some of us happen to like the simplicity of it all.
[*] mIRC *is* designed to cater for small-scale file exchange between friends, like baby pics and holiday snaps. Even mIRC's author acknowledges that these limited capabilities are in no way up to the standard of dedicated file sharing systems - for the simple reason that they aren't meant to be!
[*] Some people think that using a chat system for illegal file sharing is either clever or cool. It's neither, and will ultimately result in servers and perhaps entire networks being shut down to avoid legal action or the expense of preventing criminal activity.
[*] Even for those people who persist in distributing movies and music in violation of copyright, there is no single standard for searching for files - exactly BECAUSE this is not what the IRC networks or the mIRC client are designed for. There is therefore no answer to your question.
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