Recently I was trying to add some 2-D depiction capabilities to a C# app so I decided to try using OASA through IronPython ala Pybel. Unfortunately attempting to load the oasa module using IronPython PythonEngine throws an exception. The fcntl package is linux only in CPython. Apparently the windows version just contains a workaround. IronPython does not support the fcntl package and so it can't load the subprocess module.
You can check for progress on a workaround at: