The reason i want it to open in IE is to hide all the formulas from my customers.
I don't think running Excel inside the browser will necessarily prevent your formulas from being viewed.
You could:
Turn on the hidden property of the cell and use worksheet protection to hide the formulas.
Turn off the formula bar in the workbook (and maybe column/row headers as well).
Hide the formula sheet and use a "front sheet" that displays the values of the formula sheet.Example: cell A1 of Sheet2 is linked to another cell on sheet1: =Sheet1!A1
However, to open Excel in IE you only need to create a link pointing to the file location, making sure to provide the complete path and exact file name with extension.
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