It's a long story in Perl. Why write something from scratch? (especially when you'd have to write both server and client) Get FTP server software. Or use gnutella. (Update) Or, set up a web server and put the files in your HTML tree (that should work on Windows / *nix-style platforms).

This is a wheel you shouldn't try to reinvent.

HTH

Philosophy can be made out of anything. Or less -- Jerry A. Fodor