title: Wix File Association - Misunderstanding
body: <p>I have an application and I want to use my own file extension that opens my application when double clicked.
  I'm using Wix to build my installer and understand that I can make use of file association in my .wxs file. A snippet from the file currently looks like this:</p>
  
  <pre><code>&lt;DirectoryRef Id ="INSTALLFOLDER"&gt;
          &lt;Component Id ="RBUpdate.exe" Guid="*"&gt;
              &lt;File Id="RBUpdate.exe" KeyPath="yes" Source="$(var.RBUpdate.TargetDir)RBUpdate.exe" /&gt;
              &lt;ProgId Id ="MyProgID" Description="RBUpdate data files" Advertise="yes"&gt;
                  &lt;Extension Id ="rbu" ContentType="application/rbu"&gt;
                      &lt;Verb Id ="open" Command="open" TargetFile="RBUpdate.exe" Argument="&amp;quot;%1&amp;quot;"/&gt;
                  &lt;/Extension&gt;
              &lt;/ProgId&gt;
          &lt;/Component&gt;
      &lt;/DirectoryRef&gt;
  
      &lt;Feature Id ="ProductFeature" Title="RBUpdateSetup" Level="1"&gt;
          &lt;ComponentRef Id ="RBUpdate.exe"/&gt;
      &lt;/Feature&gt;
  </code></pre>
  
  <p>This builds fine but, if I'm honest, I'm new to this and not quite quite sure what it does. </p>
  
  <p>How do I create an instance of my created file type? The files I'm creating are not going to be as a result of running the application and they will be manually made externally to the application, which it will then load. I simply want to be able to make an xml file, name it with the .rbu extension, and have it open with my application.</p>