You can connect to the windows machine and use filezilla or winscp to connect to your unix machine and get the file from the unix machine to you windows one.
You can also do that from unix, but requires an FTP server runs on the windows machines so you can connect to it and push the file (assuming the network is configured to let you come in, and that you have an user account to connect to that server)
If you have an easy access to both of the server : USB key