Convert old documents from the command line

• WDB (Microsoft Works database)

  soffice --headless --convert-to ods file.wdb
  

• WKS (Microsoft Works spreadsheet)

  soffice --headless --convert-to ods file.wks
  

• WPS (Microsoft Works document)

  soffice --headless --convert-to odt file.wps
  

• WRI (Microsoft Write document)

  soffice --headless --convert-to odt file.wri