You can direct connect to them if you both have your firewalls properly configured to allow LW access to the internet.
How to use Bitzi Web Lookup .. & How to use Magnet Links & Direct Connect/Browse/Chat"]
How to use Bitzi Web Lookup .. & How to use Magnet Links & Direct Connect/Browse/Chat[/URL]
If you can't get that to work, you could try using a file hosting site. Upload the file there and send the other person a link to the file. If it's confidental you can zip it up and password protect it.