| Subject: | ExcelCSV should mention modules that handle xlsx |
The xlsx format is more open, results in smaller files, and is just plain saner than the xls monstrosity. I feel any "enlightened" effort should at least point out this option to developers who need Excel files.
I've personally used and can vouch for Excel::Writer::XLSX - it's by the same author as that of Spreadsheet::WriteExcel, on which the currently included Spreadsheet::WriteExcel::Simple is based.
A cursory search also gives Spreadsheet::XLSX::Assist for writing xlsx files, and SimpleXlsx and Spreadsheet::ParseXLSX for reading them.