https://www.bleepingcomputer.com/news/microsoft/microsoft-releases-october-2019-office-updates-with-fixes-improvements/ > Microsoft released the October 2019 non-security Microsoft Office updates that fix issues and add improvements to Windows Installer (MSI) editions of Office 2013 2010, Office 2013, and Office 2016. > For instance, after applying this month's update, "Outlook now can block the sending and receiving of Python files (.py, .pyc, .pyo, .pyw, .pyz and .pyzw) as attachments."