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Each version of Acrobat and Reader close holes that cause security problems. Malformed pdf files that can be read with older versions can sometimes not be opened, since purposely malformed pdf files can use these holes to break into your computer system. So the long and short of it is that you will probably never be able to open the pdf file with a newer version of the Reader. Your only option might be to get a program like Ghostscript and use it to refry your pdf file. That is Print from Reader 8 to Ghostscript to create a new pdf file. This new pdf file might not have the corruption that is in the one you are having problems with.
Thanks for the idea. Disappointing if true.
Thing is... it's an old hydro bill... I'm just keeping it for posterity's sake (a bill from when I was paying for nuclear power!?!)
Most troubling and disconcerting.
So, who should be sued? Adobe? My hydro company? ;-) Just kidding.
Anyway... some time gone by...
- re-installed Adobe X
- as per ghostscript.com, downloaded Ghostscript v9.01 & Gsview v4.9 (McAfee okayed them)
- installed Ghostscript & Gsview
- started Gsview
- dragged & dropped one of the offending hydro bill PDFs from Windows Explorer into Gsview
- from File menu picked Convert
- for Device pdfwrite, upped Resolution from the default 600 to 720
- via the Properties button in the Convert dialogue, adjusted CompatibiliyLevel to 1.2, clicked OK in Properties dialogue
- clicked OK again back in the Convert dialogue
- in the Output Filename dialogue, made the new file a "b" copy of the original filename
- clicked Save
The new file is a tenth the size of the old one & opens without incident in Adobe X. Ghostscript works well... thanks.
But... is this really the optimal solution for businesses & governments? It's not as if the old files were on vellum and here we are like old monks, transcribing for the king. Good grief where are we going?