Set up a ftp server on one of the machines, that should work.

The only other way i can think of(there maybe be specifik software that can de excatly what you´re talking about) is using somekind of unix machin in betwen, that mounts a appleshare(or whatever it called, i dont remember) in e.g. /mac and then again share /mac via smb, then you can view the mac´s shares via the network browser in windows!