title: Openslide-python import error
body: <p>I receive the following error when running <code>import openslide</code> from inside python terminal</p>
  
  <pre><code>&lt;code&gt;Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
    File "C:\dev_res\python\python2_713\lib\site-packages\openslide\__init__.py", line 29, in &lt;module&gt;
      from openslide import lowlevel
    File "C:\dev_res\python\python2_713\lib\site-packages\openslide\lowlevel.py", line 41, in &lt;module&gt;
      _lib = cdll.LoadLibrary('libopenslide-0.dll')
    File "C:\dev_res\python\python2_713\lib\ctypes\__init__.py", line 440, in LoadLibrary
      return self._dlltype(name)
    File "C:\dev_res\python\python2_713\lib\ctypes\__init__.py", line 362, in __init__
      self._handle = _dlopen(self._name, mode)
  WindowsError: [Error 127] The specified procedure could not be found
  &lt;/code&gt;
  </code></pre>
  
  <p>My OS is Windows 64-bit and I am using Python 2.7.13 (64-bit). I installed the OpenSlide binaries (2016-7-17 64-bit release) and added the corresponding bin folder to my system path. I then installed python-openslide using pip. Please note that this error is different from <code>WindowsError: [Error 126] The specified module could not be found</code> (<a href="https://stackoverflow.com/questions/39527410/openslide-python-import-showwindows-error">see question</a>) which occurs when the windows binaries have not been added to the system path.</p>
  
  <p>Same problem occurs when using Python 3.5.3. Interestingly, I tried the same workflow except with the 32-bit versions (python 2.7 32-bit and 32-bit openslide binaries) and I did not receive this error. However, I would prefer to use the 64-bit versions.</p>
  
  <p>Any help would be greatly appreciated. Thanks!</p>