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I have several PDF files that cannot be open in neither Adobe Reader X nor XI, in Win7 64-bit as well as Windows Server 2008 R2. I have the message as shown Two days back, I have received an email with PDF file attachment. When I tried to open PDF file, it shows an error message which says: "format error: not. Sometimes while trying to open a PDF document you may encounter the following error message: 'There was an error opening this document. The file is damagedThe only real way to open files that are unsupported by the software you are using is to convert the file type into one that is supported. I contacted the sender and made them aware of our problem. They said they send similar files to all their other contacts in the same manner and no one else Continue to get error response when attempting to open PDF file. File is a few years old and was saved in Outlook attached to an older email message.