Interpreter does not consider PYTHONPATH environment variable

[VegetaSSJ5]

Hello,

I have a problem executing scripts because the environment variable PYTHONPATH is not recognized.
I have downloaded the minimal python x64 embeddable zip and extracted it into a directory. This is the output of sys.path without set PYTHONPATH in the shell.

C:\Development\python-3.6.2-embed-amd64>python
Python 3.6.2 (v3.6.2:5fd33b5, Jul  8 2017, 04:57:36) [MSC v.1900 64 bit (AMD64)] on win32
>>> import sys
>>> print(sys.path)
['C:\\Development\\python-3.6.2-embed-amd64\\python36.zip', 'C:\\Development\\python-3.6.2-embed-amd64']
>>> sys.exit()

Then I set the variable PYTHONPATH

C:\Development\python-3.6.2-embed-amd64>SET PYTHONPATH=C:\Development\test

C:\Development\python-3.6.2-embed-amd64>echo %PYTHONPATH%
C:\Development\test

Now the output of sys.path should contain the directory C:\Development\test but...

C:\Development\python-3.6.2-embed-amd64>python
Python 3.6.2 (v3.6.2:5fd33b5, Jul  8 2017, 04:57:36) [MSC v.1900 64 bit (AMD64)] on win32
>>> import sys
>>> print(sys.path)
['C:\\Development\\python-3.6.2-embed-amd64\\python36.zip', 'C:\\Development\\python-3.6.2-embed-amd64']

Why PYTHONPATH is not recognized by the interpreter?

Thank you.