title: Python 3.7 - activate venv error Parameter format not correct 65001 WINDOWS
body: <p>I just updated my python version to 3.7 but every time i activate my virtualenv i got the following error message: <strong>parameter format not correct - 65001</strong></p>
  
  <p>Anybody knows what this mean and how to solve this issue?</p>
  
  <p>Thanks in advance!</p>