title: Python C extension: Use extension PYD or DLL?
body: <p>I have a Python extension written in C and I wonder if I should use the file extension DLL or PYD under Windows. (And what would I use in Linux?)</p>
  
  <p>Are there any differences (besides the filename)?</p>
  
  <p>I found <a href="http://pyfaq.infogami.com/is-a-pyd-file-the-same-as-a-dll" rel="noreferrer">an unofficial article</a>. Is this the secret of pyc?
  Why can't I find any official article on this topic?</p>