microsoft word email attachment gets blocked

Question

Does anybody knows why the microsoft word email attachments gets blocked?

If I received 2 attachments:

1. a pdf document and
2. a .doc document,

just the .doc document gets blocked, I download to any folder and look at the properties and appears this button "unblock", when I click on that button now I can see the document.

Answer 1

According to this article, Blocked attachments in Outlook, this behavior intentional to protect your computer from harm.

To help protect your computer, Outlook doesn’t allow you to receive files of certain types (such as .exe files) as attachments, because of their potential for introducing a virus into your computer. By default, Outlook blocks these files.

Why are Word documents blocked? Somehow the .doc extension was added as a blocked file type.