Thank you. Does he have a windows or mac computer?
Does he have Microsoft Office program (like you do)? If yes, can you tell him not to open your word document file right away, but tell him to download / save your attachment to a folder on his computer first, then open that folder, then open that word document file, then he should be able to edit it.
Please reply at the box below to continue troubleshooting. Thank you.
You're welcome. Whenever you can, please reply at the box below, and let me know the result. I will help further if there is still any issue. Thank you very much,