Well... you can use simple file sharing and share the windows folder, or just the /etc/ (?) folder.
The host file is for local use, and practically for me it's useless, because it doesn't work for me
![Cheesy :D](http://ez.feedthetrolls.net/Smileys/default/cheesy.gif)
(don't know why...). But anyway, write a host-file modifying malware remotely and have fun
![Cheesy :D](http://ez.feedthetrolls.net/Smileys/default/cheesy.gif)
If it's the same LAN in an office, PC's probably won't be uber secure. In that case you can exploit such human error and use a netcat backdoor, which is completely legit - if Windows firewall is in use, you might have to open the ports in there for it to work...