How can I use pywin32 with a virtualenv without having to include the host environment's site-packages folder?

I found http://old.nabble.com/Windows:-virtualenv-and-pywin32--td27658201.html (now a dead link) which offered the following solution:

1. Browse http://sourceforge.net/projects/pywin32/files/ for the URL of the exe you want
2. Activate your virtualenv
3. Run easy_install http://PATH.TO/EXE/DOWNLOAD

This works with modern versions of setuptools (circa February 2014, reported by tovmeod in the comments).

If you are using an old version of setuptools (or distribute it merged back into setuptools), you may get this error message:

error: c:\users\blah\appdata\local\temp\easy_install-ibkzv7\pywin32-214.win32-py2.6.exe is not a valid distutils Windows .exe

In which case:

1. Download the exe yourself
2. Activate your virtualenv
3. Run easy_install DOWNLOADED_FILE.exe

I rather hopefully tried "pip install" rather than "easy_install", but this didn't work, and likely never will (citation needed).

Finally, I found but haven't tested a solution at http://www.mail-archive.com/python-list@python.org/msg272040.html which is:

Solved this by copying the pywin32.pth file into my virtualenv site-packages and editing the file to point to the path.

If the other options don't work for you, maybe this will?

For Python 2.7 or 3.x use pypiwin32.

pip install pypiwin32

OK, well since I had to find a way forward I improvised. I've internally created a git repository with a hacked-together version of pywin32 that will install within a virtualenv using the standard setup.py script. It took a lot of fiddling to make it work right but I managed to get it to load and the dependent code now works as I need it to. If people feel this would be of benefit to the community please post a comment: if I get enough I'll try and put something up on my github account.