StarOffice XML Writer (.sxw)
The SXW file extension stands for StarOffice XML Writer and is associated with the StarOffice and Apache OpenOffice Writer applications. Developed by Sun Microsystems, SXW files are based on the OpenDocument XML format and contain formatted text, images, tables, and other rich content similar to Microsoft Word's DOCX files. Although StarOffice has been discontinued, SXW files can still be opened with OpenOffice Writer.