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Platform incompatibility (32-bit vs. 64-bit)


Overview

When installing certain older versions of Jet Essentials, the user must determine whether to install the 32-bit edition of Jet Essentials or the 64-bit edition.

During the install process, the install program queries the Windows Registry to make sure that the "bit level" being installed matches the bit level of Microsoft Office.


 

The install program will first examine this Registry key


HKEY_CLASSES_ROOT\Excel.Application\CurVer

 

to determine what version of MS Office is installed.


If you are using a 64-bit version of Windows and the version of Office could be either a 32-bit or 64-bit edition, the Jet install program will then query the Registry to find out which edition is present.

Microsoft Office stores this information in this Registry key:


HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\{version number}\Outlook\Bitness

 

 

If that Registry key is not present, the Jet install program will not be able to verify the edition of MS Office and the install will stop.

If that Registry key setting (either "x86" or "x64") is somehow configured for the incorrect value (including case sensitivity), the install will proceed, but Excel will not be able to enable the Jet add-in because the bit level of the two applications will not match.

If there is an issue with the Windows Registry that is preventing you from installing Jet Essentials or is preventing Jet Essentials from working once it is installed, please contact your system administrator for the best solution for your organization.


 
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