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Editorial Team
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Asked: 2026-05-13T09:05:25+00:00

I am writing an installer using Wix 3 which installs a plugin to a

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I am writing an installer using Wix 3 which installs a plugin to a 3rd party application. The application uses a group of registry keys to detect installed plugins. Each plugin is required to add a new subkey with a numerical name from 0-9 to the HKEY_LOCAL_MACHINE\SOFTWARE\Vendor\App\Plugins. The key contains a single string value which is the ProgId of a COM component which the application will instantiate. So for example I would need to add the following key to install my plugin:

HKEY_LOCAL_MACHINE\SOFTWARE\Vendor\App\Plugins\0
  REG_SZ   ProgId    "MyCompany.MyPlugin"

However, if the 0 key already exits, my installer needs to be smart enough to create key 1 instead of 0 and on down through key 9. Is there a way to achieve this using the Wix syntax? I know I can write a custom action to do this, but if at all possible I would like to avoid it.

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1 Answer

  1. Editorial Team

    You could use RegistrySearch to find the first empty value. But it would be easier to use the approach I describe at http://www.joyofsetup.com/2007/07/01/semi-custom-actions/.

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