PDF2Word is programmed to write (.docx) files, which is compatible with Word 2007 and later but, once converted, you can then save the file to a (.doc) format which would work for Word 97-2003.

You can visit this article from Microsoft Office Support to better help you with saving a document that can be opened in an earlier version of Word:

https://support.office.com/en-us/article/Save-a-document-in-Word