Python 2: (Export/)Import broken for filenames containing non-ASCII characters

[d-maurer]

BUG/PROBLEM REPORT

Export an object with a non-ASCII id (this results in a filename with non-ASCII characters);
import it (at a different place). This fails with

Traceback (innermost last):

    Module ZPublisher.WSGIPublisher, line 162, in transaction_pubevents
    Module ZPublisher.WSGIPublisher, line 359, in publish_module
    Module ZPublisher.WSGIPublisher, line 262, in publish
    Module ZPublisher.mapply, line 85, in mapply
    Module ZPublisher.WSGIPublisher, line 63, in call_object
    Module OFS.ObjectManager, line 660, in manage_importObject
    Module posixpath, line 73, in join

UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 1: ordinal not in range(128)

What version of Python and Zope/Addons I am using:

Python 2, Zope 4.x