Windows opens .py file with C:\Python27\Python.exe despite rebinding Python.File

Question

I followed Python's official FAQ to make .py file executable, i.e. adding .py to $PATHEXT and bind Python.File to "C:\Python27\Python.exe" "%1" %*. The result was fine:

>assoc .py
.py=Python.File
>ftype Python.File
Python.File="C:\Python27\Python.exe" "%1" %*

I recently installed virtualenv and hope to run a django project in a virtual environment called env1. The path to env1 is: "D:\env1". when I entered env1 in cmd, and try to execute django-admin.py directly, an ImportError Exception is thrown. I figured this is because windows invoked my default python interpreter(c:\Python27\python.exe) under which django is not installed. So I tried the following:

ftype Python.File="D:\env1\Scripts\python.exe" "%1" %*

The command executed successfully. However, the behaviour of executing .py file didn't change at all. Either double clicking the file or executing it directly by filename in cmd, c:\python27\python.exe was always invoked, as was shown from Task Manager.

At this point I can only think of that this problem is related to some windows settings and has nothing to do with virtualenv. Please help to get the binding work properly, Thanks!

Answer 1

Another key is overriding the key set by ftype. You can search for the key using Registry Editor also known as regedit. Search for

C:\Python27\Python.exe