I'm not sure how available files in non-shared directories are. I will experiment with this when I am off the corporate network. It seems that if I do netstat -a and get a list of systems I am connecting to I can then either do ftp <IP> and attempt a logon or net use <ip> or map network drive <ip> with the second 2 choices I will only see files in shared folders. It is a security hole but a simple enough patch is disable sharing in drives/directories you don't want outsiders to see (I think by default 2000/nt c drive is shared -thank you m$).

Cheers,
-D