Cannot branch a repo on Windows because of reserved file names

[Eli Zaretskii]

  D:\usr\eli\bzr>bzr branch git://git.sv.gnu.org/libunwind.git
  bzr: ERROR: File exists: u'D:/usr/eli/bzr/libunwind.git/aux': [Error 183] Cannot create a file when that file already exists

This happens because "AUX" is a reserved name on MS-Windows (it's a
character device).

Is there any way around this in bzr?  Should I file a bug report?

Thanks.