I am not sure that I fully understand the issue - but it seems that trunk still has this issue.
As stated by Amaury - this is on DEBUG builds only.

c:\>pcbuild\python_d.exe
Python 3.3a0 (default, May 28 2011, 20:22:11) [MSC v.1500 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import nul
[60967 refs]
>>> import con
^Z
[60986 refs]

c:\>PCbuild\python.exe
Python 3.3a0 (default, May 28 2011, 20:25:13) [MSC v.1500 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import nul
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: DLL load failed: The parameter is incorrect.
>>> import con
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: DLL load failed: The specified module could not be found.
>>>