Check out some options how arff files might be converted to xlsx format.
You can certainly convert arff to csv, so further export to XLSX should be just matter of importing the file to Excel and saving the data as spreadsheet. Except for that, we unfortunately do know about any program that could be used for arff to xlsx conversion directly.
Unfortunately, there is no detailed software record in the database for this conversion.
Additional links: Open arff file, Open xlsx file
ARFF
Files with arff extension are related to Attribute-Relation file format. Some sort of ASCII format used by Machine Learning Project at the Department of Computer Science of The University of Waikato.
XLSX
Files with xlsx extension are s used by Microsoft Excel for its workbooks (spreadsheets) in Office Open XML format. XLSX is the latest spreadsheet format used by Excel with the adoption of XML formatting first used in Office 2007. While older xls files were in proprietary binary file format, xlsx spreadsheets use a somewhat altered XML scheme.
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