Re: Anybody who opens a DOCX file from the Internet is a fool
It's not the file thats the problem so much as the fact that 99% of users can be expected to use the same software to open the file, ie a monoculture... If you have an exploit for a vulnerability in that software you have a very high chance of success.
That's why monoculture software is almost always the primary target of malware... Think of all the browser exploits which targeted IE when it had over 90% of market share, and how most of these attacks moved to Flash, Java, Acrobat etc once the browser market became more diverse.