The description of stw format expansion
The stw file is a document template originally created by StarOffice, the predecessor to Apache OpenOffice. The stw document uses an older software file format before Apache OpenOffice adopted the newer odt OpenDocument format. The stw file object is used for writing sdw documents from the same template.
The STW format is used by StarOffice 6 and Apache OpenOffice version 1. Apache OpenOffice 2 and later use the ODT format instead.