Microsoft will soon be blocking an additional 38 file extension from being downloaded as attachments in Outlook on the Web in order to protect users from malicious files. These additional extensions includes files used by Java, PowerShell, Python, and various vulnerabilities. […]

from https://www.bleepingcomputer.com/news/microsoft/outlook-on-the-web-to-block-file-extensions-for-powershell-python-and-more/