Those are Win32 (pywin32) extensions source code for Python.
As for Python itself, these extensions require MSVC7 for Python 2.4 and later, otherwise MSVC6. Some extensions require a recent "Platform SDK" from Microsoft, and in general, the latest service packs should be installed, but run 'setup.py' without any arguments to see specific information about dependencies. A vanilla MSVC installation should be able to build most extensions and list any extensions that could not be built due to missing libraries - if the build actually fails with your configuration, please log a bug via http://sourceforge.net/projects/pywin32.
