Yes, I'd be happy to. Do you have a shared drive that I can upload a sample to?

You can upload files here. A zipped project would do.

Thanks for taking time to answer my question. It's much appreciated :)

The attached zip-file contains to project. The only difference between them, apart from their names, is that the project 'DelphiFromPython_DCP.dproj' has 'Link with runtime packages' set to true:

dcp_test.zip

Python 3.12.3 was used:

Firstly, you should not be using LoadDLL in your extension modules but LoadDllInExtensionModule. See https://github.com/pyscripter/python4delphi/blob/master/Modules/DemoModule/uMain.pas as a guide.

Regarding runtime packages, is the directory containing them in the path?
Even if it is there was a change in python when searching for dlls. The Windows path is no longer searched.
See
https://docs.python.org/3/library/os.html#os.add_dll_directory
and https://stackoverflow.com/questions/67805339/is-the-function-os-add-dll-directory-adding-directories-permanently.

You can try:

• copying all runtime packages in the same directory as the pyd file.
• or use the os.add_dll_directory function before importing the pyd extension module.