Depending on how your Unix box can serve up files you could use:
A) FTP transfer protocol to get file(s) - then your Unix box has to have an FTP server installed and running. Many Unix computers acting as servers have or it is easy to set up.
B) Samba/SMB/CIF protocol - which is Windows own file sharing protocol. Can be installed on most Unix operating systems - then a file share mapping could be done towards the Unix box acting as a "Windows" file server. And you can retrieve the files via a drive letter like you would do with a Windows server.
The A option would look like this:
(txt, codepage is 28591, no labels, delimiter is '\t', msq);
You will have to create a connection named FTP and it has to be a "Webfile" type of connection. Specify:
<user> would be replaced by the actual user name that you have for the FTP account
<password> the password for the FTP account
<ftpserver> should be the IP-address or hostname of the Unix computer
<file> the file that is on the default directory of the FTP account, you might need a path to override
Be aware that FTP is not a secure communication protocol if it is not done on a secure net or combined with an SSH-tunnel - so study the security implications before using FTP.