import does not handle tarball character encodings

I have exported a repos on my mac. Later I tried to import that package into a repos on a pc.
The following crash dump message appears...

Run command: bzr import H:/machine-10-05-12.tar.gz
bzr: ERROR: exceptions.UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 48: ordinal not in range(128)

Traceback (most recent call last):
  File "bzrlib\commands.pyo", line 853, in exception_to_return_code
  File "bzrlib\commands.pyo", line 1055, in run_bzr
  File "bzrlib\commands.pyo", line 661, in run_argv_aliases
  File "bzrlib\commands.pyo", line 665, in run_direct
  File "bzrlib\cleanup.pyo", line 122, in run_simple
  File "bzrlib\cleanup.pyo", line 156, in _do_with_cleanups
  File "C:/Program Files/Bazaar/plugins\qbzr\lib\commands.py", line 788, in run
  File "C:/Program Files/Bazaar/plugins\qbzr\lib\subprocess.py", line 786, in run_subprocess_command
  File "bzrlib\commands.pyo", line 1055, in run_bzr
  File "C:/Program Files/Bazaar/plugins\bzrtools\command.py", line 13, in run_argv_aliases
  File "bzrlib\commands.pyo", line 661, in run_argv_aliases
  File "bzrlib\commands.pyo", line 665, in run_direct
  File "bzrlib\cleanup.pyo", line 122, in run_simple
  File "bzrlib\cleanup.pyo", line 156, in _do_with_cleanups
  File "C:/Program Files/Bazaar/plugins\bzrtools\command_classes.py", line 506, in run
  File "C:/Program Files/Bazaar/plugins\bzrtools\upstream_import.py", line 276, in do_import
  File "C:/Program Files/Bazaar/plugins\bzrtools\upstream_import.py", line 171, in import_tar
  File "C:/Program Files/Bazaar/plugins\bzrtools\upstream_import.py", line 207, in import_archive
  File "bzrlib\transform.pyo", line 301, in trans_id_tree_path
  File "bzrlib\transform.pyo", line 1380, in canonical_path
  File "bzrlib\workingtree.pyo", line 394, in abspath
  File "bzrlib\osutils.pyo", line 342, in _win32_pathjoin
  File "ntpath.pyo", line 102, in join
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 48: ordinal not in range(128)

bzr 2.1.1 on python 2.5.4 (Windows-XP-5.1.2600-SP3)
arguments: ['C:\\Program Files\\Bazaar\\bzr.exe', 'qsubprocess', '--bencode', 'l6:import30:H:/machine-10-05-12.tar.gze']
encoding: 'cp1252', fsenc: 'mbcs', lang: None
plugins:
  bzrtools C:\Program Files\Bazaar\plugins\bzrtools [2.1.0]
  explorer C:\Program Files\Bazaar\plugins\explorer [1.0.1]
  launchpad C:\Program Files\Bazaar\plugins\launchpad [2.1.1]
  netrc_credential_store C:\Program Files\Bazaar\plugins\netrc_credential_store [2.1.1]
  news_merge C:\Program Files\Bazaar\plugins\news_merge [2.1.1]
  qbzr C:\Program Files\Bazaar\plugins\qbzr [0.18.4]
  rebase C:\Program Files\Bazaar\plugins\rebase [0.5.5]
  svn C:\Program Files\Bazaar\plugins\svn [1.0.2]
  upload C:\Program Files\Bazaar\plugins\upload [1.0.0dev]
  xmloutput C:\Program Files\Bazaar\plugins\xmloutput [0.8.7.dev]

*** Bazaar has encountered an internal error. This probably indicates a
    bug in Bazaar. You can help us fix it by filing a bug report at
        https://bugs.launchpad.net/bzr/+filebug
    including this traceback and a description of the problem.