A family of Microsoft word processing software products for creating web, email, and print documents.
Frankly I would urge you to reconsider the legacy form fields and use content controls (which should be protected as read only and not as forms). It is no more difficult to extract the data you require to Excel and controls can be much more flexible.
You may find https://www.gmayor.com/insert_content_control_addin.htm useful as it will provide a means cof converting your legacy fields to content controls, and provides all the editing tools you will require to simplify the task.
You may also find http://www.gmayor.com/ExtractDataFromForms.htm useful whether you work with legacy form fields or content controls.