ExcelWriter Error: This file does not appear to be a valid Excel 97 or later binary file

Problem

When trying to open an XLSX or XLSM file with ExcelApplication, you get the following error message:

This file does not appear to be a valid Excel 97 or later binary file. Please try opening in Excel 97 later by saving as “Microsoft Excel Workbook (*.xls)”

Solution

Support for the Office 2007/2010 file formats (XLSX, XLSM) was introduced for ExcelApplication in ExcelWriter 8. Earlier versions with throw the above exception when attempting to open an XLSX file with ExcelApplication.

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