Tonight I have been able to get an HP 3478A to have control via GPIB with an HP 82350 PCI to GPIB card using this software (HP 3478A Control and Data Logging Software by Nirvak). I have previously had it working with the 82357 USB version. I know the readme file says "This works with the HP82357A USB-GPIB adapter but not the 82350B PCI bus adapter." but I tried loading the latest NI and Keysight libraries and -- voila!
I am running Windows 10 64 bit 21H1 for the OS here.
First I updated the NI to version 21 with ni-visa_21.0_online update.
Next I updated my Keysight with the offline updater, Keysight_IOLibSuite2022_18_2_27313.exe
I configured both to be active with NI preferred in the Keysight VISA conflict manager and made sure to check the "enable Keysight GPIB cards for 488 ..."
I confirmmed that Connection Expert could see and talk to the 3478 - Note that the 3478 does not support *IDN? so I used the Device Clear command. Next I used NI MAX with NI VISA interactive Control to send an 'H3" command to read 2-wire Ohms which worked OK.
Finally I ran the HP 3478A Control and Data Logging Software from
https://github.com/Niravk1997/HP-3478A-Software/releases page.
It connected and runs fine. Many Thanks for this. Here is a screen capture with a 50 Ohm terminator connected: