/usr/lib/libreoffice/program/wizards/letter/ is in libreoffice-common 1:4.2.3~rc3-0ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/libreoffice/program/wizards/letter/CGLetter.py
/usr/lib/libreoffice/program/wizards/letter/CGLetterWizard.py
/usr/lib/libreoffice/program/wizards/letter/CGPaperElementLocation.py
/usr/lib/libreoffice/program/wizards/letter/CallWizard.py
/usr/lib/libreoffice/program/wizards/letter/LetterDocument.py
/usr/lib/libreoffice/program/wizards/letter/LetterWizardDialog.py
/usr/lib/libreoffice/program/wizards/letter/LetterWizardDialogConst.py
/usr/lib/libreoffice/program/wizards/letter/LetterWizardDialogImpl.py
/usr/lib/libreoffice/program/wizards/letter/LetterWizardDialogResources.py
/usr/lib/libreoffice/program/wizards/letter/__init__.py