It does not seem likely to use a document spreadsheet, such as .stw files from older OpenOffice.org, for making new spreadsheets in Microsoft Excel format (.xls, .xlsx). You need a spreadsheet template, not a document template if you want to create spreadsheet based on predefined settings.
Home > Search converters: stw to xlsx
Conversion of stw file format to xlsx file format beta
Search for stw to xlsx converter or software able to handle these file types.
Found 2 different conversion types using the same filename extensions.
Conversion stw to xlsx type 1:
Convert from OpenOffice.org text document template to Microsoft Excel Open XML workbook and spreadsheet.
Unfortunately, there is no detailed software record in the database that match this conversion.
Additional links: stw file extension details, xlsx file extension details
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Conversion stw to xlsx type 2:
Convert from Statistica workbook to Microsoft Excel Open XML workbook and spreadsheet.
Unfortunately, there is no detailed software record in the database that match this conversion.
Additional links: stw file extension details, xlsx file extension details
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