bzr: ERROR: exceptions.MemoryError after commit

I created a test repository to play a bit with bzr to check if it fits to my requirements. I added a 450MB big file (mail archive) and comitted.

C:\Dokumente und Einstellungen\Joerg\Desktop\bzrrepo>bzr ci -mfoo
Committing to: C:/Dokumente und Einstellungen/Joerg/Desktop/bzrrepo/
bzr: ERROR: exceptions.MemoryError:

Traceback (most recent call last):
  File "bzrlib\commands.pyc", line 834, in run_bzr_catch_errors
  File "bzrlib\commands.pyc", line 790, in run_bzr
  File "bzrlib\commands.pyc", line 492, in run_argv_aliases
  File "bzrlib\builtins.pyc", line 2355, in run
  File "bzrlib\decorators.pyc", line 165, in write_locked
  File "bzrlib\workingtree_4.pyc", line 246, in commit
  File "bzrlib\decorators.pyc", line 165, in write_locked
  File "bzrlib\mutabletree.pyc", line 187, in commit
  File "bzrlib\commit.pyc", line 355, in commit
  File "bzrlib\commit.pyc", line 656, in _update_builder_with_changes
  File "bzrlib\commit.pyc", line 784, in _populate_from_inventory
  File "bzrlib\commit.pyc", line 826, in _record_entry
  File "bzrlib\repository.pyc", line 362, in record_entry_contents
  File "bzrlib\repofmt\pack_repo.pyc", line 91, in _add_text_to_weave
  File "bzrlib\repofmt\pack_repo.pyc", line 1171, in _add_text_to_weave
  File "bzrlib\versionedfile.pyc", line 138, in add_lines_with_ghosts
  File "bzrlib\knit.pyc", line 984, in _add_lines_with_ghosts
  File "bzrlib\knit.pyc", line 1020, in _add
MemoryError

bzr 1.3.1 on python 2.5.2.final.0 (win32)
arguments: ['bzr', 'ci', '-mfoo']
encoding: 'cp1252', fsenc: 'mbcs', lang: 'DE'
plugins:
  launchpad C:\Programme\Bazaar\plugins\launchpad [unknown]
*** Bazaar has encountered an internal error.
    Please report a bug at https://bugs.launchpad.net/bzr/+filebug
    including this traceback, and a description of what you
    were doing when the error occurred.

----------------------
I am using the latest version of bzr:

C:\Dokumente und Einstellungen\Joerg\Desktop\bzrrepo>bzr version
Bazaar (bzr) 1.3.1
  Python interpreter: C:\Programme\Bazaar\python25.dll 2.5.2.final.0
  Python standard library: C:\Programme\Bazaar\lib\library.zip
  bzrlib: C:\Programme\Bazaar\lib\library.zip\bzrlib
  Bazaar configuration: C:\Dokumente und Einstellungen\Joerg\Anwendungsdaten\baz
aar\2.0
  Bazaar log file: C:\Dokumente und Einstellungen\Joerg\Eigene Dateien\.bzr.log

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