SXW is a text file format. From the very beginning, it was created for StarOffice Writer, that is, an application that processes texts from the Sun Microsystem StarOffice office suite. StarOffice was developed by Sun Microsystems. Then it was bought by Oracle. That's why Star Office has evolved into Apache Open Office, and is now a commercial Oracle product. At the same time, it is the same software product as the free program OpenOffice.org. The only difference is that the new Open Office provides technical support for packages. The Apache Software Foundation supports the Apache OpenOffice software package, and it provides a universal set of tools designed to work with vector drawings, spreadsheets, text documents, databases, etc. The .sxw file is an OpenOffice text document that is saved in XML-based Sun XML Writer (SXW) format. Currently, the SXW format and other OpenOffice formats that are outdated have skipped ahead of the family of standard OpenDocument Format (ODF) formats with .odt extensions without preserving compatibility between them. SXW files are opened by programs such as StarOffice Writer and OpenOffice.org Writer.
DOCX is a more modern version of the DOC text file format, which appeared in Microsoft Word 2007 from Microsoft. It takes its name from the full name of Microsoft Word Open XML Document. As in the previous version, DOCX format files contain not only textual information, but also tables, charts, images, and you can perform any formatting actions with the text. The main difference is that a DOCX text document is not a binary file, but a set of separate files (XML files, docProps, Word and _rels folders) in a ZIP compression package. This gives maximum file security without damaging or losing data.