How do I setup virtualenvwrapper for Windows PowerShell?

Question

I have this installed

• on Windows 7
• Python 2.7.6 (my default, with virtualenv installed)
• Python 2.4.4
• Python 2.5.4
• Python 2.6.6
• Python 3.3.3
• virtualenv 1.10.1
• virtualenvwrapper_powershell-12.7.8-py2.7

I want to test code on all of those python installations.

(Related question about missing support for Python 2.4./2.5: How do I setup virtualenv environments for Python 2.4 and 2.5 versions on Windows? )

This is what I tried so far:

Trying virtualenv directly:

Python 2.6 works as expected:

C:\Users\martin\.virtualenvs>virtualenv -p c:\apps\Python26\python.exe env26
Running virtualenv with interpreter c:\apps\Python26\python.exe
New python executable in env26\Scripts\python.exe
Installing Setuptools..............done.
Installing Pip.............done.

C:\Users\martin\.virtualenvs>env26\Scripts\activate
(env26) C:\Users\martin\.virtualenvs>python
Python 2.6.6 (r266:84297, Aug 24 2010, 18:46:32) [MSC v.1500 32 bit (Intel)] on
win32
Type "help", "copyright", "credits" or "license" for more information.
>>>

Python 2.7 and 3.3 also work as expected.

Trying virtualenvwrapper:

Python 2.6, 2.7, and 3.3 work as expected:

C:\Users\martin\.virtualenvs>mkvirtualenv -p c:\apps\Python26\python.exe env26_w

Running virtualenv with interpreter c:\apps\Python26\python.exe
New python executable in env26_w\Scripts\python.exe
Installing Setuptools.........done.
Installing Pip................done.

(env26_w) C:\Users\martin\.virtualenvs>python
Python 2.6.6 (r266:84297, Aug 24 2010, 18:46:32) [MSC v.1500 32 bit (Intel)] on
win32
Type "help", "copyright", "credits" or "license" for more information.
>>>

Trying virtualenvwrapper on Powershell:

Creating and activating Python 2.6 does not give an error, but starts Python27 when activated:

PS C:\Users\martin> mkvirtualenv -p C:\apps\Python26\python.exe env_26_ps
New python executable in env_26_ps\Scripts\python.exe
Installing Setuptools........done.
Installing Pip.......................done.
Added activation script por Powershell to C:\Users\martin\.virtualenvs/env_26_ps\Scripts.
(env_26_ps)PS C:\Users\martin> python
Python 2.7.6 (default, Nov 10 2013, 19:24:18) [MSC v.1500 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>>

The env_26_ps\Scripts folder contains files like pip-2.7.exe and python.exe (2.7).

Similar behavior for Python 3.3