Documents saved in one of the SDW formats (Lotus Word Pro, early OpenOffice etc.) can be typically saved to another document format like formats from Microsoft Word (DOC/DOCX). If you do not have access to Microsoft Office, some of the open source office solutions can be used for this conversion.
Found 2 different conversion types using the same filename extensions.
Conversion sdw to docx type 1:
Convert from Lotus WordPro drawing file to Microsoft Word Open XML document.
Microsoft Windows software - convert sdw to docx on Windows
A free word processing program, part of GNOME office productivity bundle
File type (from-> to)
Convert from sdw file format
Lotus WordPro drawing file
Microsoft Word Open XML document
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned sdw to docx. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Conversion sdw to docx type 2:
Convert from OpenOffice.org text document to Microsoft Word Open XML document.
Apple macOS / Mac OS X software - convert sdw to docx on OS X
A full-featured set of office applications for Mac OS X
Multiplatform software - convert sdw to docx on any platform
Full-featured word processing and desktop publishing tool from LibreOffice suite
Word processor and text editor from OpenOffice.org suite