title: 'helloworld.pyx' doesn't match any files
body: <p>I am a beginner in python and I have just got familiar with cython as well. I am using Anaconda on Windows 64-bit. I am trying to run the "helloworld" example as follows:</p>
  
  <p>1- I build a helloworld.pyx file containing:</p>
  
  <pre><code>    print("Hello World")
  </code></pre>
  
  <p>2- I build a setup.py file containing:</p>
  
  <pre><code>   from distutils.core import setup
     from Cython.Build import cythonize
  
     setup(name='Hello world app',ext_modules=cythonize("helloworld.pyx"),)
  </code></pre>
  
  <p>But I get the following error:</p>
  
  <pre><code>   'helloworld.pyx' doesn't match any files
  </code></pre>
  
  <p>Could you please tell me what should I do now? Where should I save these two files?</p>