Serial Port File Transfer. Click on the serial radio button to set the connection type. To transmit hit enter and type in the lower pane.

Putty is a free and open source terminal emulator serial console and network file transfer application. Hit the serial radio button and press ok. However i am unable to transfer over a file.
It supports several network protocols including scp ssh telnet rlogin and raw socket connection.
Then theres the serial port program transfer issue on top of it. To start capturing serial data one will need to download serial port monitor install and start the application. When running an lrzsz command use the system level serial port device files to specify the port number eg. This software would connect the computers thereby enabling both systems to support file transfer.