.NET AddIn on Office on a 64-bit machine

[David Thielen]

Is there anything special we need to do if Office is running on a
64-bit system? It appears that it still calls our AddIn in 32-bit
mode.

??? - thanks - dave

david@[email protected]
Windward Reports -- http://www.WindwardReports.com
me -- http://dave.thielen.com

Cubicle Wars - http://www.windwardreports.com/film.htm

 

[Jialiang Ge [MSFT]]

Hello Dave,

SvenC is right. Office Word, Excel, PowerPoint, and other client-side
Office products have no 64bit version released. 32bit applications run
under WoW64 subsystem on all 64bit versions of Windows. Because a 32bit
process (e.g. Office Word process) cannot load a 64bit module into its
process space, and vice versa, we need to make sure that our add-in
solution is not set to target the 64bit environment only. Also note that,
32bit components are registered to HKEY_CLASSES_ROOT\WOW64\CLSID in a 64bit
system while 64bit components are registered to HKEY_CLASSES_ROOT\CLSID.

Please let me know if you have any other concerns, or need anything else.

Regards,
Jialiang Ge ([email protected], remove 'online.')
Microsoft Online Community Support

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[SvenC]

Hi David,

Is there anything special we need to do if Office is running on a
64-bit system? It appears that it still calls our AddIn in 32-bit
mode.

Office is a 32-bit app so it can only use 32-bit addins.