title: How to concat two variables at installlocation path
body: <p>I have some problem on WIX basic setup configuration.
  I want to install my files into ProgramFiles/NameOfCompany/NameOfProduct.
  I have the following configuration now:</p>
  
  <pre><code>&lt;?define ProductName="ProductName" ?&gt;
  &lt;?define Manufacturer="CompanyName"?&gt;
  &lt;Directory Id="TARGETDIR" Name="SourceDir"&gt;
    &lt;Directory Id="ProgramFilesFolder"&gt;
      &lt;Directory Id="INSTALLLOCATION" Name="$(var.ProductName)"&gt;
        &lt;Component Id="ProductComponent" Guid="b11556a2-e066-4393-af5c-9c9210187eb2"&gt;
          &lt;File Id='SampleAppEXE' Name='SampleApp.exe' Source='ClipboardActiveX.dll' Vital='yes' /&gt;
        &lt;/Component&gt;
      &lt;/Directory&gt;
    &lt;/Directory&gt;
  &lt;/Directory&gt;
  </code></pre>
  
  <p>The problem is that i got the following error when i try to set something like this folder1/folder2 at INSTALLLOCATION directory entry:</p>
  
  <pre><code>The Directory/@Name attribute's value, 'folder1/folder2', is not a valid long name because it contains illegal characters.  Legal long names contain no more than 260 characters and must contain at least one non-period character.  Any character except for the follow may be used: \ ? | &gt; &lt; : / * ".
  </code></pre>
  
  <p>I want something like this one:</p>
  
  <pre><code>&lt;?define ProductName="ProductName" ?&gt;
  &lt;?define Manufacturer="CompanyName"?&gt;
  &lt;Directory Id="TARGETDIR" Name="SourceDir"&gt;
    &lt;Directory Id="ProgramFilesFolder"&gt;
      &lt;Directory Id="INSTALLLOCATION" Name="$(var.Manufacturer)\$(var.ProductName)"&gt;
        &lt;Component Id="ProductComponent" Guid="b11556a2-e066-4393-af5c-9c9210187eb2"&gt;
          &lt;File Id='SampleAppEXE' Name='SampleApp.exe' Source='ClipboardActiveX.dll' Vital='yes' /&gt;
        &lt;/Component&gt;
      &lt;/Directory&gt;
    &lt;/Directory&gt;
  &lt;/Directory&gt;
  </code></pre>