damaged Illustrator file, repair needed!

Hello,

I can't open my Illu file. Illustator attempts a recovery but shows nothing but an empty layer.

As far as I know, the saving process went smooth and Illu was closed properly after the saving was finished, it also has the expected file size and in the Illustrator "Welcome to Illustrator" window it shows the correct preview of the layer I worked on lastly with the latest changes (but then shows nothing when I open it). I remember in the last two days of using Illustrator, I got messages when starting Illustrator that my preferences file was corrupted and had been reset. Apart from that nothing suspicious happened.

The file is dear to me, it's an important and large project.

It's quite large (660mb), it has many layers and pixel graphics.

Could someone from Adobe take a look at it? I don't want to post a link here, as its content is not meant for public sharing, but would happily send a link to someone from Adobe.

I tried some repair tools, online and offline, but to no avail. Creating a new document and placing the file won't work, neither does opening it in Acrobat.

I was just at the finishing touches of the project and then the file went bust, most ironically. I believe the whole content is there in the file, uncorrupted (like the fact that it can load a preview on the Welcome window). I would be deeply grateful if it could be recovered, or at least as much as possible.

Greetings and thanks in advance

Simon