Working with Document Security
The 2007 Microsoft Office system introduces a new XML-based file format with new security features for protecting your document content. The Microsoft Office system now supports separate formats for different types of files: the "x" format (for example, docx), a secure file format that cannot contain macros or ActiveX controls, and the "m" format (for example, docm), which is a format that can contain active content. When you attempt to save a document containing macros as a Microsoft Office file with an "x" extension, the application will warn you that the macros will be removed and suggests saving the file as a macro-enabled file type instead.
When a document is opened that contains potentially unsafe content, such ...
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