SDW is an open source document file that is associated with OpenOffice.org. This file is created with earlier versions of StarWriter. In the later versions of StarWriter SXW extension is used instead of SDW. SDW supports some basic document format options.
DOCX is an XML based word processing file developed by Microsoft. DOCX files are different than DOC files as DOCX files store data in separate compressed files and folders. Earlier versions of Microsoft Office (earlier than Office 2007) do not support DOCX files because DOCX is XML based where the earlier versions save DOC file as a single binary file.
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