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UseMsiGetFeatureState(ISMSI_HANDLE, "Your Feature Id", nvInstallState, nvActionStateFeature); ... if (nvActionStateFeature == 3) then ... endif;

It only work with properties, not String Identifiers

You are able to read with the method LoadStringFromStringTable ("ID_STRING", svIdString);equivalent to svIdString = @ID_STRING; //Not ANSI supportedunlike ofMsiGetProperty (hMSI, "YourProperty", svYourProperty, nvSize); that it is for read Property v...