I need your help ...
I worked on my file, then I saved it ...
But, when I tried to reopen, I met some problems...
Can you help me ?
Thank you very much !
Ah, thank you very much !
I'm a little awkward !
Fortunately, I had an other version of my file. But I wanted to understand the problem !
Thank you !
Somehow this file is filled with raw postscript code rather than Mathematica. Probably you Saved your notebook as Postscript and overwrote your original file that way. Sadly your original notebook is lost unless you have a backup. You may be able to see some of the contents if you change the .nb to .ps and open the file in a postscript interpreter.