Maybe I misunderstand you - if you have .xls files, you cannot rename them to .xlsx and expect them to work.

If you want to read .xls files from Perl, see Spreadsheet::ParseExcel.

In reply to Re^3: Win32::OLE for Excel fails to open newly generated XLS file by Corion
in thread Win32::OLE for Excel fails to open newly generated XLS file by woland99

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