Hi Jeff,
The PF-1000 does NOT have a USB-to-Host terminal, but just a proprietary "To Host" multi-pin terminal. You can connect an optional Yamaha USB interface (UX series) to it. There was the Yamaha CBX MIDI Driver for this, but as far as I know it is not yet compatible with Windows 10. And the current Yamaha USB-MIDI Driver (V4.3.1 x64) is probably not compatible with the old UX USB MIDI interface mentioned.
Fortunately, the PF-1000 also has DIN MIDI terminals. I would just use a standard DIN MIDI to USB interface (cable). Note that the PF-1000's HOST SELECT switch must be in the MIDI position.
Hope this helps!
Best regards,
Chris