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Attached is a patch which adds a winio module which is a replacement for io, but uses windows handles instead of fds.
It reimplements FileIO and open(), and provides openhandle() and closehandle() as replacements for os.open() and os.close().
test_io has been modified to exercise winio (in addition to _io and _pyio) and all the tests pass.
Note that some of the implementation (openhandle(), open(), FileIO.__init__()) is still done in Python rather than C.