The .txt format is an ASCII formt so it's open and doesn't change. The .xls and .xlsx formats are Microsoft proprietary formats and are not open or stable. That's why you need an extra layer to use them.
The .txt format is an ASCII formt so it's open and doesn't change. The .xls and .xlsx formats are Microsoft proprietary formats and are not open or stable. That's why you need an extra layer to use them.