Conversion of xlsx files to arff file format

You can use programs like the Excel to Arff Converter to export the data from Excel Spreasheets (.xls, .xlsx) to the ARFF format (.arff), which will allow you to analyze the data using the WEKA Data Mining Utility.

Open XLSX file    Open ARFF file

Related software

Excel to Arff Converter

A XLS to ARFF converter