title: entering dev_appserver.py on cmd line just opens the file. Does NOT run it
body: <p>On windows cmd line I am entering the following:
  "dev_appserver.py" myapp</p>
  
  <p>But, dev_appserver.py file just opens as a word doc.</p>
  
  <p>Could you pls let me let me know why I am not able to run it?</p>