This may be fixed already, or a bug in FC4.  Or perhaps you could
provide more information on how the bug is invoked.  I was able to
successfully execute a doctest with "\xee" in the path on an F8 box:

Python 2.5.1 (r251:54863, Oct 30 2007, 13:54:11) 
[GCC 4.1.2 20070925 (Red Hat 4.1.2-33)] on linux2

Also: Please do not quote text in the reply.
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>>> import doctest
>>> doctest.testfile('foo\xeebar/test.txt')
(0, 1)
>>> 
guin:pytest$ cat fo*/test.txt
The ``example`` module
======================

Using ``print``
-------------------

This is a test example.

   >>> print 'Hello world!'
   Hello world!