[pypy-issue] Issue #3134: pypy3+Windows: Non-ASCII filenames broken (pypy/pypy)

[Christoph Reiter]

New issue 3134: pypy3+Windows: Non-ASCII filenames broken
https://bitbucket.org/pypy/pypy/issues/3134/pypy3-windows-non-ascii-filenames-broken

Christoph Reiter:

```python
import os
fn = 'öäü.mp3'
with open(fn, 'wb'):
    assert os.path.exists(fn)
```

Works with Python 3, fails with PyPy 3 on Windows 10.

The file gets creates with PyPy3 though, even with the right name.

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