Acrobat/Reader: International registry keys being accessed too many times


When you open a PDF file in Adobe Acrobat/Reader you may notice that the client reads the following registry keys repeatedly:

HKEY_USERS\…\Control Panel\International\sDecimal

HKEY_USERS\…\Control Panel\International\sThousand

The result of reading these keys if often BUFFER OVERFLOW.  It’s unnecessary for Acrobat/Reader to access these registry keys multiple times when opening a single PDF file. If you’re using Terminal Server environments, where only one client services multiple users, this issues can lead to performance degradation.


Update to Adobe Acrobat/Reader 9.4 or X.

Additional information

It’s common for a BUFFER OVERFLOW to occur when reading registry keys on application startup. This error doesn’t necessarily point to a memory issue in Acrobat/Reader. Adobe Acrobat/Reader 9.4, X and later have been updated to access these keys only once when opening a PDF file. The number of BUFFER OVERFLOW events is therefore also reduced.

 reference: (181470806/2596701)

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Reader 9.1: registry persmissions modified causing issues with Internet Explorer


Installing Reader 9.1 modifies Registry permissions for key HKEY_CLASSES_ROOT\Interface\{34A715A0-6587-11D0-924A-0020AFC7AC4D} from “Full Control” to “Read“.  This modification prevents a successful installation in enterprise environments where customized installer files are used. The mentioned key is a part of the Internet Explorer installation and applications that work with the web browser events use it.

The Access Control List for this key before installation is as follows:


BUILTIN\Power Users=Special




Following installation it has been changed to:





Upgrade to Adobe Reader 9.4 or Adobe Reader X.  Do a full installation of one of these versions to apply the fix.

As a workaround, you can modify the MST file with Customization Wizard to prevent the permissions on this key being changed.

reference: (181120121/2356114)

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