on yahoo, I open the email and there's an 'attachments text', then underneath is my doc file icon (says DOC right on the icon). Is yours attached as a zip or other type?
Have you checked your Office app to see if it's there?
I re attached the file from my pc to the email, then sent it to the phone, and now they're both attached as docx, and work fine, idk maybe I just attached the original one wrong or something. Anyway thanks for the help