This plug isn't working for me either
, I can receive files but I can't send them. I think it's about the port forwarding. I don't know how to
... I have a Sitecom Dc-202 router btw...
EDIT:
Also I have a suggestion.
What if you let it send a special ping after you typed /xsendfile and picked the file, and if there's a special pong it sends the file the special way, and if you don't get a pong, (meaning the other person does'nt have the plugin) it uses the normal way, (using /dropfile or something)