The utility.Rename interface calls utility.copyfile to rename the files passed to it, however it always uses a symlink and doesn't allow the user to specify whether they would rather copy the file instead. I'm working on a CIFS filesystem, where symlinks are not allowed (at least, users are not allowed to create them; calling os.symlink always returns [Errno 95] Operation not supported), and so this prevents me from being able to use the Rename interface.