The Secure Socket Shell (SSH) daemon runs by default on the FMP. Hence, it can be used to transfer files to or from an external Windows system, provided that an SSH client is installed on the Windows system.
The Windows operating system does not support SSH. However there are many SSH client software with user friendly graphical user interface that are available for free. For example, FileZilla from filezilla-project.org and WinSCP from winscp.net are some of the popular SSH client software. You can download and install any one of the free SSH client software on the Windows system, and then transfer the files by referring to the documentation associated with the SSH client software.
Note: The FMP supports SFTP and SCP on port 22.