First I saved and after I exported to PDF, when it crashed and became irrecoverable.
I have tried some of the things in the link you put. I still can't open the file with Indesign but at least I've been able to export the file to a .txt, thanks to one of the application in that thread. That's enough for me, now I can start over and remake it pretty fast.
Thanks a lot!
Please email your InDesign file to firstname.lastname@example.org. We will take a look at the document.
If the file is larger than 10 Mb, you can zip (and password protect) the file and upload to Creative Cloud account (or Dropbox) and send us the document link.
What InDesign version are you using?
Indesign CC version 2015.0, with Windows 10.
Thanks a lot for sending me the file recovered, Sanyam!