Inside an Excel File

As I've noted, Excel 2007 uses a new XML format for its workbooks, templates, and addins. These files are actually ZIP compressed files. As such, they can be "unzipped" and examined.

Previous versions of Excel used a binary file format. Although the binary file format specifications are known, working with binary files is not easy. The Excel 2007 XML file format, on the other hand, is an "open format." As such, these files can be created and manipulated using other software.

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