I was trying to save my file in another folder and this message appered, and somehow now lost acess to my skb file as well. PLEASE MY FILE IS VERY IMPORTANTE AND IT WAS FINISHED, I NEED HELP AND THE MESSAGE UNEXPECTED FORMAT STILL APPEARS. I HAVE A PRESENTATION TO SHOW TO MY CLIENTS AND NOW I CANT!
I download the latest version on web just now, but the one I do use is 2020 installed on my notebook. I was saving in a shared folder. The file looks perfect on my desktop but when I try to open it says that message. My english is not so good. How do I share the file?
As is usually the case, I only recovered components, materials, tags, and styles. There is nothing to be seen in the model. You would need to rebuild things by dragging components from the Components tray.
Something else you could try is to get Properties on the file in its network folder, and look at the Previous Versions tab. If you have that feature turned on, Windows may have some older versions of the file that you can use.