Shell Programming and Scripting

I'm working on setting up an automated script on a unix server to secure ftp (get) a file from a remote host which is a windows server with Vshell . I understand in order for the paswword-less authentication to work , I need to copy the authorization keys of our server(Solaris) to the remote host (Windows). Which location on the remote host(windows server) the authorization keys will need to be copied to?

Any ideas will be greatly appreciated.

Use manual pages for the sftp/ssh.
Use google.
Use "search".
All of the options should give you the answer.

Start with determining where is the SSH/SFTP server and where is the client - that information is missing from your post.
To simplify things: try logging into the server using ssh (this is probably easier to find).
Good luck and do not expect more help from me - you should be able to find this if you spend some time on this topic.