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Asked: 2026-05-10T15:50:57+00:00

We have an application that works with MS Office and uses Microsoft.mshtml.dll. We use

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We have an application that works with MS Office and uses Microsoft.mshtml.dll. We use ClickOnce to deploy the application. The application deploys without issues on most machines, but sometimes we get errors saying ‘System Update Required, Microsoft.mshtl.dll should be in the GAC’.

We tried installing the PIA for Office without luck. Since Microsoft.mshtml.dll is a system dependent file we cannot include it in the package and re-distribute it. What would be the best way to deploy the application?

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  1. Do you know which version of MS Office you are targeting? These PIAs are very specific to the version of Office. I remember when we were building a smart client application, we used to have Build VM machines, each one targeting a specific version of Outlook.

    Another hurdle was not being able to specify these PIAs as pre-requisites or bundle them with the app. These PIAs needs to be installed on the client using Office CD (at least for 2003 version).

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