Adobe Reader could not open '*.pdf' because it is either not a supported file type or because the file has been damaged (for example, it was sent as an email attachment and was not correctly decoded.)

I get a file on the mail and when I get it I get this error. I've tried all the programs and variants, nothing is vseravno: "Adobe Reader could not open '*.pdf' because it is either not a supported file type or because the file has been damaged (for example, it was sent as an email attachment and was not correctly decoded.)"

There is nothing on the inside of the notebook

I can provide a file for convenience .... Help !!!!