There was no problem with visa32.dll and 32-bit Python(3.5-32).
However after the host is start using 64-bit applications, visa64.dll and Python3.8.
Here is a python scripts:
import pyvisa as visa
rm = visa.ResourceManager('C:\\WINDOWS\\System32\\visa64.dll')
r = rm.list_resources()
r
('USB0::0x05E6::0x2602::4444666::INSTR',
'USB0::0x05E6::0x2220::9204496::INSTR',
'ASRL1::INSTR',
'GPIB0::30::INSTR',
'TCPIP0::127.0.0.1::hislip5-0.0::INSTR',
'USB0::0x05E6::0x2220::9204275::0::INSTR',
'USB0::0x05E6::0x2220::9204567::0::INSTR',
'USB0::0x0957::0x1807::MY50001918::0::INSTR')
# no problem for USB
dev = rm.open_resource('USB0::0x05E6::0x2220::9204496::INSTR')
dev = rm.open_resource('USB0::0x05E6::0x2602::4444666::INSTR')
# open GPIB failed
dev = rm.open_resource('GPIB0::30::INSTR')
in handle_return_value
raise errors.VisaIOError(rv)
pyvisa.errors.VisaIOError: VI_ERROR_RSRC_NFOUND (-1073807343): Insufficient location information or the requested device or resource is not present in the system.
