Since your target is a spreadsheet on Windows, it would make sense to write directly to the spreadsheet. You can use either the xlsReadWrite package, Description: Read and write Excelfiles natively (v97-2003/BIFF8) or RExcel, which allows you to imbed R functions inside Excel cells. Look at the main RExcel/rcom site http://sunsite.univie.ac.at/rcom/ and consider joining the mailing list there.
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