popular module :- spreadsheet::ParseExcel
able to read xls file
unable to read .xlsx file
Spreadsheet::XLSX
focus on reading value for xlsx file
limited functionality
http://groups.google.com/group/spreadsheet-writeexcel/browse_thread/thread/9a69b3da83db317?pli=1
Excel::reader
read xlsx file (haven't test out)
https://github.com/jmcnamara/excel-reader-xlsx
