...
print(ctypes.sizeof(ctypes.c_wchar))
_PyObject_Dump=ctypes.pythonapi._PyObject_Dump
_PyObject_Dump.argtypes=(ctypes.py_object,)
print(_PyObject_Dump(dirname))
print(list(dirname))

in Python 3.3.0 64-bit on Windows 8 produces:

2
object  : 'D:\\Bug reports\\Python\\test\\sub-fcc\\bulk'
type    : str
refcount: 3
address : 00000000028AC298
54
['D', ':', '\\', 'B', 'u', 'g', ' ', 'r', 'e', 'p', 'o', 'r', 't', 's', '\\', 'P', 'y', 't', 'h', 'o', 'n', '\\', 't', 'e', 's', 't', '\\', 's', 'u', 'b', '-', 'f', 'c', 'c', '\\', 'b', 'u', 'l', 'k']