Microsoft Antivirus Defense in Depth Guide

Microsoft has provided an antivirus defense in depth guide.
I don’t quite understand why they choose to make documents available via MSI. Do I really need to get yet another item in my start menu just to read a pdf? The first thing I note after installing the document is that the pdf is 666 KB. Apparently this antivirus document is of the devil.
This is a long document that begins with a brief definition and history of viruses, and moves on to many best practices that should be implemented. It is well worth a read.