Put multiple files inside a Visual Studio bootstrapper

Question

I have an installer with an external UI handler. Therefore, I have a Setup.exe and a setup.msi file. How can I put both files inside the bootstrapper? Thank you.

<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003"&gt;
<ItemGroup>
    <BootstrapperFile Include="Microsoft.Net.Framework.3.5">
        <ProductName>Microsoft .NET Framework 3.5</ProductName>
    </BootstrapperFile>
</ItemGroup>

<Target Name="BuildBootstrapper">
    <GenerateBootstrapper
        ApplicationName="Setup.exe"
        BootstrapperItems="@(BootstrapperFile)"
        OutputPath="C:\output" />
</Target>
</Project>