4.9. Understanding Word's New Open XML File Format
Since the first mention of Word documents in this book, I have tried to emphasize the difference between Word 2007 documents and documents created with earlier versions of Word. Perhaps at one point you discovered that you could not open a Word document you received from a coworker who already had Word 2007 because you still had only Word 2003.
When Microsoft released Office 2007, it changed the default file format for Office documents. To avoid confusion between different formats, Microsoft also changed the extension name for Office 2007 documents by adding an "x." Thus, .doc becomes .docx, .xls becomes .xlsx, and .ppt becomes .pptx.
You might ask, what is with the "x" added to the end of each ...
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