With tools like the Excel to Arff Converter it should be quite possible to convert your data in Excel format to ARFF format, so you can analyze the data and results with the WEKA Data Mining Utility.
Convert Microsoft Excel 97 to 2003 workbook to Weka attribute-relation data.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert xls to arff on Windows
Excel to Arff Converter is a small utility used to convert data in Excel format to ARFF format.
Convert from xls file
to arff file
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.