Microsoft Office Tutorials and References
In Depth Information
Using the New Binary File Format: BIFF12
11. In Windows Explorer, right-click the document name (which is in the
format filename.xlsm) and select Rename.
22. Change the file extension to .zip. Windows warns you that if you
change a file extension, the file may become unusable.
33. Click Yes to confirm the change.
44. Open the Zip file with WinZip or any other Zip utility.
As shown in Figure 7.6 , inside the Zip file, you can see several XML com-
ponents. The embedded image is included in the Zip file. All the settings and
styles, drawings, and data are stored as separate XML files within the Zip
file. Unzipped, these components would take up 115KB. However, because they
are zipped files, only 40KB is needed to store the data.
Figure 7.6.
Figure 7.6. The components of the workbook are stored as XML files, zipped,
The components of the workbook are stored as XML files, zipped,
and then renamed with an .xlsx or .xlsm extension.
and then renamed with an .xlsx or .xlsm extension.
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