Docx arraybuffer file download corrupt

I do not know why the option specified in the question does not work. But I found a solution, so to say "in another forest". I'm not very versed, so I'll just describe the process of solving the problem. For the beginning I will immediately say that the problem was on the client's side. The method on the server worked correctly from the start. I decided to use another method to download the files "fetch". And came across the next post in the forum. From there I took the following answer

He did not work for me either. I changed it so

Because of this line nothing happened

This option worked, but with screwed. He saved the file with a strange name and no extension. Then I changed it so.

And it works! I apologize for the English. I'm using Google translator