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Adobe Acrobat Reader and Foxit Reader both have a feature that allows them to remember what was the last page the user was reading.

Where do these PDF readers (both Adobe and Foxit) store such information?

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Your earlier post version would seek to have an innumerable list of Readers. – random Oct 8 '12 at 4:12

Most likely the registry. For instance, Foxit Reader stores that information at the following location:
HKCU\Software\Foxit Software\Foxit Reader 5.0\Preferences\History\LastOpen
(The exact path might be slightly different for different versions.)

Ther's a subkey for each recently opened file, and a value called Page stores the page number where that file was opened last.

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Any idea on where Adobe Acrobat should keep this? – Voyska Oct 5 '12 at 21:54
I don't have Adobe Reader installed on any of my computers so can't check, but try searching through HKCU\Software\Adobe and its subkeys. – Indrek Oct 5 '12 at 22:58

In some cases, I think this kind of data can be stored as metadata for the PDF, which is basically just key-value pairs.

In other cases it might be stored by the particular application used to open/modify the PDF (the location would then vary from application to application).

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