Cannot load Dll/Pyd from QGIS

[Tiehong]

Environment

• Pythonnet version: 3.0 (64 bit)
• Python version: 3.9 (64 bit)
• Operating System: Windows 11
• .NET Runtime: Net Framework 4.7.2

Details

• Describe what you were trying to get done.

  I was trying to use some QGIS functions (64 bit).

• What commands did you run to trigger this issue? If you can provide a
  Minimal, Complete, and Verifiable example
  this will help us understand the issue.

Here is my code. You will need to download and install QGIS3.8.2.

import os
import ctypes

p = r'C:\PROGRA1\QGIS321.2\apps\qgis\bin;C:\PROGRA1\QGIS321.2\apps\grass\grass78\lib;C:\PROGRA1\QGIS321.2\apps\grass\grass78\bin;C:\PROGRA1\QGIS321.2\apps\qt5\bin;C:\PROGRA1\QGIS321.2\apps\Python39;C:\PROGRA1\QGIS321.2\bin'#;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\system32\WBem'
lst=p.split(';')
lst.append(r'C:\WINDOWS')
lst.append(r'C:\WINDOWS\sysWOW64')
for f in lst:
os.add_dll_directory(f)

os.environ["PATH"]=';'.join(lst)

ctypes.WinDLL(r"C:\Program Files\QGIS 3.28.2\apps\qgis\python\qgis_core.pyd")

• If there was a crash, please include the traceback here.

An error was thrown at ctypes.WinDLL():

[WinError 193] %1 is not a valid Win32 application
File "C:\Program Files\QGIS 3.28.2\apps\Python39\Lib\ctypes_init_.py", line 374, in init

The same code runs OK in Python3.9 64 bit. I wonder if Python runtime was trying to load a 32 bit DLL while a 64 bit DLL with the same file name exists. If that's the case, is there an option to prioritize the 64 bit DLL?