A family of Microsoft word processing software products for creating web, email, and print documents.
FYI, there's a batch converter here on GMayor's website
Batch converter for Word 97-2003 DOC format and Works WPS format to DOCX/DOCM - An add-in for Word 2010 and later) to batch convert Word 97-2003 DOC format and Works WPS format documents to Word DOCX format (or in the case of DOC files with macros to DOTM format) from hard drive folders and sub-folders.
It's a specialty addin from here: https://www.gmayor.com/Document_Batch_Converter.htm
GMayor has also written a more general "Batch" addin here:
Apply processes to a batch of Word documents https://www.gmayor.com/document_batch_processes.htm