updating .po files with 'django-admin.py makemessages' under windows with russian locale fail

[gurovic@…]

django1.7, python 3.2, windows 7 64 bit russian

---
I have Windows 7 Rus, default encoding is cp1251.
If i have some translations in .po-file in russian (utf-8 encoding),
and running makemessages again to add new phrases, it uses msgmerge.exe in function write_po_file,
popen got output in cp1251 encoding instead utf-8 and crashes:

Exception in thread Thread-63:
Traceback (most recent call last):
  File "c:\python32\lib\threading.py", line 740, in _bootstrap_inner
    self.run()
  File "c:\python32\lib\threading.py", line 693, in run
    self._target(*self._args, **self._kwargs)
  File "c:\python32\lib\subprocess.py", line 1013, in _readerthread
    buffer.append(fh.read())
  File "c:\python32\lib\encodings\cp1251.py", line 23, in decode
    return codecs.charmap_decode(input,self.errors,decoding_table)[0]
UnicodeDecodeError: 'charmap' codec can't decode byte 0x98 in position 1157: character maps to <undefined>

Traceback (most recent call last):
  File "c:\python32\Scripts\django-admin-script.py", line 9, in <module>
    load_entry_point('Django==1.7a1', 'console_scripts', 'django-admin')()
  File "c:\python32\lib\site-packages\django-1.7a1-py3.2.egg\django\core\management\__init__.py", line 427, in execute_from_command_line
    utility.execute()
  File "c:\python32\lib\site-packages\django-1.7a1-py3.2.egg\django\core\management\__init__.py", line 419, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "c:\python32\lib\site-packages\django-1.7a1-py3.2.egg\django\core\management\base.py", line 288, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "c:\python32\lib\site-packages\django-1.7a1-py3.2.egg\django\core\management\base.py", line 337, in execute
    output = self.handle(*args, **options)
  File "c:\python32\lib\site-packages\django-1.7a1-py3.2.egg\django\core\management\base.py", line 529, in handle
    return self.handle_noargs(**options)
  File "c:\python32\lib\site-packages\django-1.7a1-py3.2.egg\django\core\management\commands\makemessages.py", line 288, in handle_noargs
    self.write_po_file(potfile, locale)
  File "c:\python32\lib\site-packages\django-1.7a1-py3.2.egg\django\core\management\commands\makemessages.py", line 399, in write_po_file
    msgs, errors, status = popen_wrapper(args)
  File "c:\python32\lib\site-packages\django-1.7a1-py3.2.egg\django\core\management\utils.py", line 25, in popen_wrapper
    output, errors = p.communicate()
  File "c:\python32\lib\subprocess.py", line 813, in communicate
    return self._communicate(input)
  File "c:\python32\lib\subprocess.py", line 1050, in _communicate
    stdout = stdout[0]
IndexError: list index out of range

popen runs for the following process:

['msgmerge', '-q', 'C:\\temp\\oluch\\oluch\\locale\\ru\\LC_MESSAGES\\django.po', 'C:\\temp\\oluch\\oluch\\locale\\django.pot'] 

[Claude Paroz]

Is this a regression from Django 1.6?