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I don't have Excel'07 installed on my machine, but I need to work with .xlsx files.

Excel'03 has a compatibility pack, but I could only open xslx files, not being able to save or create them.

Do you know any free alternatives to work with .xlsx ?

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Once you import the xlsx file, change it and store it as xls. Why do you want to store it as xlsx again? – trex279 Jul 24 '09 at 14:16
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OpenOffice.org Calc works opens .xlsx files and works with them just fine, only it can't save as .xlsx as well - you'd need to save as .xls or .xml (Excel 2003 XML). But generally there should be no problem saving as .xls/.xml unless you are using some very unique Excel 2007 features that aren't available in older versions.

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Google Docs supposedly can work with .xlsx now

http://www.ghacks.net/2009/06/02/google-docs-adds-docx-and-xlsx-support/

Edit: I just tested it out, you can import the .xlsx and work with it, but google docs can't save as xlsx yet, so, you'd need to export it back out as xls or other supported format. Still, it is a free option that will let you work with the data.

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