The description of these behaviors is termed the mechanism. When scientists are not provided with such a mechanism, then a description of a process, it's explanation, or it's understanding, is questioned. Astrology does not work with mechanisms. It works with relationships, patterns, tendencies, and interpretations. It does not always give a yes or no answer.
I hate the Drawing Canvas and I understand that it's not backward compatible, so I never use it. To turn it off in Word 2002 and above, go to Tools 4 Options, General tab. Untick Automatically create drawing canvas....
VSTO, or Visual Studio Tools for Office, or Microsoft Visual Studio Tools is part of Microsoft's Visual Studio .NET tools suite and supports the Microsoft .NET Framework. It is used by developers to write code connecting Microsoft Office Word, Excel and Outlook applications. Developers using VSTO can employ C# or Visual Basic languages.