This short article shows you how to manual calculation when open an xlsx Excel file.
The problem we have sometime is that the spreadsheet figure looking fine in the outlook preview.
One you open the open then you lost all the figure because of the automatic calculation.
In order to disable the Automatic Calculation then you need to:
1. Rename xlsx to zip.
2. Open xl\workbook.xml
3. Look for: calcPr
4. Replace fullCalcOnLoad=”1″ to calcMode=”manual”