I tried to restore it AutoCAD, but nothing happened. I am using AutoCAD 2014. The file was created in a similar version of the program. I created it is not very long, but a couple of times a clean computer from unnecessary files including the location of temporary files. And in the end when I need them, I do not have backups. I know that a little too far with cleaning my computer, but I need a drawing which is in this file. Please tell me how to recover it. No special computer problems were not in the last couple months. No viruses, breakdowns system failures. But the file is broken.