I have a system in place that writes a workbook of data to an xlsx file from an Xcode built dictionary.
The system works, but we need to have a debug analyst take a look at the output as we are losing all formatting associated with the file when saving through code.
The files open great in Numbers and Preview, but fail to open in Win or OS X Excel 2001 or 365.
We are interested in creating a relationship for future XML code as well! There is a longer term project getting ready and we need talented people to help!