when I try to open a file or document in safari on my mac 10.6 and then try to open it with Adobe Reader, I get the message, Adoby Reader could not open 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 wasn't correctly decoded). Is there any solution to this problem? I have tried to send recommendations to universities with a pdf. or doc. file but when I open the school application the file appears all black.