While both Spreadsheet::ParseExcel and Spreadsheet::WriteExcel work on Windows and Linux, neither will read or write xlsx files. I've taken the non-Perl approach of saving an xlsx file in the older xls format and then using the former to parse the document. It's a little busy work, but gets the job done. One common gotcha with this approach is that the two Excel formats have different row limits. xls has a limit of 65k rows, while xlsx has a 1 million row limit. There are other incompatibilities but I find this one to be more common.