Unable to open an PDF file - Error: the document is damaged...
Hello,
I tried to open some old PDF files (0154.pdf) by trying different versions of Adobe reader DC and Adobe Acrobe DC on a laptop and desktop. But I cannot open them.
Here is the error:"Error: the document is damaged and cannot be repaired. Adobe 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)."
So I use a text editor app to open one file. See the picture below. Is it a valid PDF file? or what kind of the file is? My friend said he could open it before. How did the pdf file get damaged or...? Any advise? Thanks so much.
Andy

