Cannot open .docx file in Writer

Please help me with my file. Originally created in MicrosoftOffice Word, it first crashed my table of contents several times after saving in Writer. Eventually it worked, and after that I add one textbox to the page with that table, and create normal pdf of it. But now I cannot open the file. On my computer with windows10 it cannot be opened with LO, Writer crashes, whereas MO Word can open it for reading - all pages are available, but pieces of text on them looks overlapped. On my other computer with win8 and the same LO version, Writer says I have no rights to redact, so it opens my file in reading mod - there are only one page available, and it is the table of content (first page), which is not working, since there is no content exept for this page. I do not understand what is going on, and how to fix my document, and where is my data.

Worst case scenario, the file is actually a .zip. Change the file extension to .zip and you can explore and extract the data with an archive program like 7zip. Or can you copy the text in Word?

What versions of LO and Word?

Thank you, I did not know it was an archive-like file. I have no Idea of how to fix it, but at least I recover the text data. Can do formating again, that is not a problem.
Word 2013, LO 5.2

You might try updating to LO 6.0. They have improved .docx support. Might help.

Just a hint: no need to change the extension if you work with 7-zip.

ok, cool. I’m used to peazip here on linux, where it’s necessary.

Had something like that happen to me. When opened in LO it had a slim yellow window at top, said something like, only could read, I clicked it and everything was ok!
When saving in LO, you options in Save As to “save as type”, it is under File Name. Try to save as type, to match your MicrosoftOffice Word year, or earlier even. I got a hunch you have done and seen the above, if not hope it helps. I also would make a copy, use copy to play with, until you got it aright.

Try Apache OpenOffice. In my experience, AOO is more stable as compared to LO and may be a good alternative for opening hard files from M$O.