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Editorial Team
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Asked: 2026-06-03T11:21:12+00:00

We have a VSTO Add in for Excel 2007. It works on all the

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We have a VSTO Add in for Excel 2007. It works on all the machines in our office except for one. This happened after MS updates last week. Basically, the Add-in won’t recognize the config file, but only on that specific machine. We uninstalled/reinstalled the application, then Excel, then the updates without any success. We then did a full Win 7 reinstall, loaded Excel, then our app, and got the same issue. We now have him running our app on a VM with XP and it’s fine. No one else in the organization is having this issue. Not sure what else to do at this point since a full windows reinstall did nothing. Any help would be appreciated.

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1 Answer

  1. Editorial Team

    Solution:

    Start > Run > RegEdit > Hkey_Current_User\Software\Microsoft\Office\Excel\Addin\YourAddInName\

    Edit the Manifest key, from:

    Manifest=”C:\Program Files\\WordAddIn.vsto|vstolocal”

    To:

    Manifest=”file:///C:\Program Files\\WordAddIn.vsto|vstolocal”

    To make this work in a deployment, right click on Setup Project in Solution Explorer > click View > Registry > and edit the key.

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