ET9_WebGL_Base/Tools/FileServer/FileServer.csproj

<Project Sdk="Microsoft.NET.Sdk.Web">

    <PropertyGroup>
        <TargetFramework>netcoreapp3.1</TargetFramework>
        <LangVersion>latest</LangVersion>
    </PropertyGroup>
    <PropertyGroup>
        <AppendTargetFrameworkToOutputPath>false</AppendTargetFrameworkToOutputPath>
    </PropertyGroup>
    <PropertyGroup Condition=" '$(Configuration)' == 'Debug' ">
      <OutputPath>../../FileServer/</OutputPath>
    </PropertyGroup>
    <PropertyGroup Condition=" '$(Configuration)' == 'Release' ">
      <OutputPath>../../FileServer/</OutputPath>
    </PropertyGroup>

    <ItemGroup>
        <PackageReference Include="Microsoft.AspNetCore.App" />
        <PackageReference Include="Microsoft.AspNetCore.Razor.Design" Version="2.2.0" PrivateAssets="All" />
        <PackageReference Include="Microsoft.AspNetCore.StaticFiles" Version="2.2.0" />
        <PackageReference Include="Microsoft.Extensions.Configuration" Version="2.2.0" />
    </ItemGroup>

    <ItemGroup>
      <_ContentIncludedByDefault Remove="Properties\launchSettings.json" />
    </ItemGroup>

    <ItemGroup>
      <Content Update="appsettings.json">
        <CopyToPublishDirectory>PreserveNewest</CopyToPublishDirectory>
        <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
      </Content>
    </ItemGroup>

</Project>