Microsoft is too smart for their own, and your, good

Microsoft Security Bulletin MS11-071 - Important : Vulnerability in Windows Components Could Allow Remote Code Execution (2570947)

Opening a .txt file can cause a "specially crafted" DLL to be loaded!

Who dreamed up this feature? Reading a plain, flat-text file should be one of the safest things that can be done on a computer system.

Install the Microsoft Windows update. You have no choice. You will be assimilated.