[python-win32] Multiple versions of Python on same machine with regsvr32.exe PYDs

[reckoner]

Hi,

I have been researching this for a couple of days now, and although 
virtualenv seems like the answer, I have been reading about problems 
with applications that require specific versions of Python in the 
registry so it can find corresponding PYD and DLL files. This means that 
it is more complicated than just setting the path differently for each 
Python installation.

In other words, if you need

c:> regsrv32.exe Some_python.pyd

then they're going to be problems if you try to change your default 
Python installation by just manipulating the Path.

Basically, my problem is I need to slowly migrate my entire software 
stack from Python version 2.6 to Python version 2.7.

Any help appreciated.