I encoded it in base64 and pasted it at the following link. See my comment above regarding the file's contents.
http://pastebin.com/dPZ3Z0x6
I used my email client as a quick way to encode it and posted the whole MIME part, in case that's somehow useful. The link will expire in a day.
I wonder how Filetea works. Their server does act as intermediary but apparently doesn't cache the file; still, my computer was online with the Filetea tab showing the file still open (but in the background). They refer to leecher and seeder so at least they are inspired by P2P file sharing networks.
This should be easier. Technically, there's no reason typical end-users couldn't anonymously and easily share files on a one-to-one basis. Maybe there is an easier way; I just hardly ever have to do it.