Introducing the Office Open XML File Formats
The new XML file formats provide a number of benefits, including easier management of hidden data, reduced file size, and improved customization and programmability options. So, what do you need to know to start using these new file formats? The answer is much easier than you might think.
The File Types
The new file types use four character file name extensions instead of the three character extensions used by most software programs. These new file types add either the letter x to the end of the extension to indicate a macro-free file, or they add the letter m to the end of the extension to indicate a macro-enabled file (that is, a file in which you can store macros written in Microsoft Visual Basic for ...
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