Kingsoft Office 2009 is compatible with the Office Open XML (also referred to as OOXML, OpenXML, or Open XML) file format from Microsoft. Kingsoft Writer can open .DOCX and Kingsoft Spreadsheets can open .XLSX. Starting with Microsoft Office 2007, the Office Open XML file formats (ECMA-376) have become the default file format of Microsoft Office.

Use Kingsoft Office to maintain compatibility and save a fortune on Microsoft Office licensing:

Kingsoft Writer and Kingsoft Spreadsheets opening .DOCX and .XLSX

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