Overhaul docs for Windows filemon install

sheesh, hopefully this is "most" of it..although definitely still not
all we need yet..

docs/base/install/windows/pywin32.rst

@@ -0,0 +1,43 @@
+
+===============================
+ Python for Windows Extensions
+===============================
+
+Python for Windows Extensions (aka. "pywin32") is a set of libraries
+which allows access to the Win32 API etc.
+
+If you want the Rattail File Monitor then you *will* need to install
+pywin32.  It may be optional if you have other aims, but it is
+generally recommended for everyone on Windows.
+
+
+Which Version?
+--------------
+
+As with Python itself, you are encouraged to use the "latest stable"
+version of pywin32 unless you have a reason to be more conservative.
+
+Other than that you just need to make sure the Python version you
+have, matches that required by the pywin32 version you have.  And the
+"bitness" must match as well, i.e. 32bit vs. 64bit.
+
+As of this writing Python 3.9 with pywin32 302 is the "latest" combo
+tested in production.  That is the situation "today" (Oct 2021) and
+eventually should change.
+
+As with Python itself, you will not likely need to "upgrade" pywin32
+anytime soon.  If you install 302 for instance then it should continue
+to work fine for the forseeable future.
+
+
+Installation
+------------
+
+Download the appropriate installer from
+`<https://github.com/mhammond/pywin32/releases>`_.
+
+Right-click the installer file and choose "Run as administrator" to
+launch it.
+
+All defaults should be fine; click through to complete the
+installation.