A family of Microsoft word processing software products for creating web, email, and print documents.
If Word is trying to open all of your PDFs, then something is wrong with the file associations.
Right-click the icon of a PDF file in File Explorer and choose Properties. On the General tab of the Properties window, click the Change button and choose Adobe Reader or whatever is your favorite PDF viewer/editor. For other methods, see https://www.howtogeek.com/746203/how-to-set-your-default-apps-on-windows-11/.