Try
http://fileforums.com/showthread.php?t=70334
Click the
Ultimate Xbox Newbie Guide link.
Go to this section to know how to link our xbox and PC together:
Networking Xbox to PC
Then go to this section:
Loading EvolutionX dashboard
That will tell you how to connect via FTP. You can skip the burning-to-cd parts if you already have it loaded on your xbox. Read that section for FTP.
Then, go to this section:
Burning Xbox Games