This will not be Excel, but a external export library. I doubt the current Excel which MS spends billions on would not be opening data if the XLS is over the '

This will not be Excel, but a external export library. I doubt the current Excel which MS spends billions on would not be opening data if the XLS is over the 'size' limit but a valid format. I guess MS hate is easier than thinking about software and logic and being a better programmer and stuff.