It’s ok Mike. It took some minutes, but the file opened!
Thank you very, very much. You saved me.
I have taken good note of all your kind suggestions in the previous posts and from now on when working on complex files I will no longer use the .docx format !!!
Thank you Silvia
more generally : Preventing data disaster - The Document Foundation Wiki
and hope your annotated appeal document is not so sensitive 
thank you.