Task 9: What is the difference between a .doc file and a .docx file? Why is this difference relevant to XML?

Microsoft released a security update KB969604 for Office 2007 (around June 2009)
This update causes document variables within Word docx files to be scrambled.  This update might still be pushed out via Office 2007 updates. 


Docx is created by Word 2007 and is Microsoft latest proprietary document incarnation. If you want users of pre-2007 versions to read your documents, save as .doc instead of .docx. Users of pre-2007 versions of Office can download and install the Compatibility Pack to read your .docx file but you can't guarantee that they have done so.

What is the difference between docx files and doc files?

Office 2007 uses Office Open XML formats with .docx and .docm filename extensions.
- Docx is an Office Open XML word document.
- Docm is a macro enabled Office Open XML document.
This means the file structure behind the scenes is quite different from the binary file formats used prior to Office 2007 such as .doc, .dot, .xls, and .ppt.

This dissimilarity is applicable to XML as it illustrates its well-built position in the generation as is valued by business that modify their program to support XML language for its suppleness and straightforwardness which is beneficial to all. Furthermore files in the latest XML format are equipped to weight less rather than the old format which has proved a significant in the user moving larger documents.