opening a pdf in word

Does anyone know how to stop word from converting a pdf in word back to word. I am operating windows 10 and I've found if you have maps and graphics in the document word will not only convert the document back to word but tends to rearrange the format and wants to rename it. So you end up with multiple pdfs of the same document all with slight changes and you can't identify the correct version because it is constantly changing. MS Office told me this is incorrect and needs to be fixed by Acrobat.