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(The title bar may say "Reader" or "Adobe Acrobat" depending on which application is trying to open the PDF)
What to do about it
To prevent the problem in the first place
If you're the one creating the PDFs and don't want your users to see this message, open the PDF in Acrobat 6, choose File, Reduce File Size and next to "Compatible with:" choose the oldest version of Acrobat/Reader you wish to support. Click OK, then re-save the file under a new name once the file size reduction process completes.
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