perl module to convert xlsx format to xls format

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http://www.unix.com – Hi Folks, I have written a perl script that reads data from excel sheet(.xls) using Spreadsheet::ParseExcel module. But the problem is this module doesn't work for excel sheets with extension .xlsx. I have gone through Spreadsheet::XLSX module with which we can read from .xlsx file directly. Is there any module to convert the .xlsx files to .xls file instead of chaning the functionality in my program ? Its not just to change the extension but after converting I should be in the position to read the .xlsx file programaticlly . Any assistance on this will be highly appreciated ..... (HowTos)