Illustrator - The file is in an unknown format and cannot be opened

Hello everyone, short time ago all my illustrator files that I saved to the hard disk were lost. I downloaded a program called EaseUs Data Recovery Wizard. It scanned the Hard Disk and found all the lost files. However, now when I try to open the ai file, the problem appears in the image that I have shared with you. I tried all the solutions brought to this problem before, but none of them worked for me. I still had a lot of projects I was working on. I'm afraid it's all gone completely.

Thank you,

Ece.