the file is large, 300 pages, weighs almost 20 MB, the archive weighs about 900 KB. (I can't) saved in rtf format, because. doc format is closed permanently. after the regular closing doesn't want to open, writes that the file is corrupted. I looked on the Internet for similar problems and ways of overcoming them. Nothing helps. Two hours already suffer. If not reinstated, I don't know what to do. That labor!

Your question is not theme. but I'll try to help you . Have you tried to restore via backup?
previously I faced a similar problem , I was helped by ms word repair, a good program that recovers almost all ) will find it here : https://www.wordrepairtoolbox.com/
good luck !!!