Message 174606 - Python tracker

I think this is what went wrong on Windows in the previous test (see
Lib/test/test_cmd_line_script.py:43):

>>> s = '\udcf1\udcea\udcf0\udce8\udcef\udcf2'
>>> f = open(s, "w")
>>> f.write("print('%s\\n' % __file__)")
>>> f.close()

C:\Users\stefan\pydev\cpython>PCbuild\amd64\python_d.exe ïïïïïï¿½
<encoding error>

So __file__ isn't set correctly, which looks like a bug to me. I'm not sure
whether it should be part of this issue or if we should open a new one.