XLS
The predecessor of the XLSX format. The XLS file extension was the default file format supported since Excel 97. XLS formats can also be opened by all newer versions of Excel as it is being kept up-to-date by Microsoft.
The predecessor of the XLSX format. The XLS file extension was the default file format supported since Excel 97. XLS formats can also be opened by all newer versions of Excel as it is being kept up-to-date by Microsoft.