FileZilla will allow access to the Digipi from Windows. You will need to SFTP (pi/raspberry) into the IP address of the digipi and look at the hidden folder /home/pi/.local/share/WSJT-X/
The . signifies the hidden folder. There may be an option in FileZilla to show hidden files, or you may have to type the address into the goto field.
I've been using Cyberduck on a Mac to do FTP.
If you install GridTracker, you can setup to automatically log contacts to QRZ or whatever system you are using.
73 David VK2VJ