title: Visual Studio F# project: Can't have two folders in a file tree with the same name?
body: <p>In Visual Studio 2013, one of my projects includes:</p>
  
  <pre><code>&lt;ItemGroup&gt;
      &lt;Compile Include="Entity\Abstract\Entity.fs" /&gt;
      &lt;Compile Include="Entity\HumanEntity.fs" /&gt;
      &lt;Compile Include="State\Abstract\State.fs" /&gt;
      &lt;Compile Include="State\Abstract\HumanState.fs" /&gt;
      &lt;Compile Include="State\Human\HumanIdleState.fs" /&gt;
      &lt;Compile Include="State\Human\HumanAwakenState.fs" /&gt;
  &lt;/ItemGroup&gt;
  </code></pre>
  
  <p>Visual Studio chokes on this, claiming that:</p>
  
  <p><code>The project 'Entity.fsproj' could not be opened because opening it would cause a folder to be rendered multiple times in the solution explorer. One such problematic item is 'State\Abstract\State.fs'.</code></p>
  
  <p>If I change the includes like so, everything is fine:</p>
  
  <pre><code>&lt;ItemGroup&gt;
      &lt;Compile Include="Entity\AbstractEntity\Entity.fs" /&gt;
      &lt;Compile Include="Entity\HumanEntity.fs" /&gt;
      &lt;Compile Include="State\AbstractState\State.fs" /&gt;
      &lt;Compile Include="State\AbstractState\HumanState.fs" /&gt;
      &lt;Compile Include="State\Human\HumanIdleState.fs" /&gt;
      &lt;Compile Include="State\Human\HumanAwakenState.fs" /&gt;
  &lt;/ItemGroup&gt;
  </code></pre>
  
  <p>Is this an oversight in VS2013, or am I doing something wrong, here?</p>