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If it were me, I'd do it in Java with Apache POI. If you want fast + low memory + xls only, then the XLS2CSVmra example + a few lines to start writing to a new file on each new sheet should do you. If you can use a bit more memory, and want to support .xlsx files too, then the ToCSV example + a few lines to write a new file on each sheet will do you there too. Would mean you'd have to write some Java though...