title: Install merge module for all users using WiX
body: <p>I created an Installer using WiX to install a VSIX along with two dependent components. These two components were available to me in the form of Merge Modules. Below is the code where I used the merge modules in my code:</p>
  
  <pre><code>&lt;DirectoryRef Id="TARGETDIR"&gt;
    &lt;Merge Id="MergeModuleID1" SourceFile="MergeModule1.msm" DiskId="1"  Language="0"/&gt;
    &lt;Merge Id="MergeModuleID2" SourceFile="MergeModule2.msm" DiskId="1" Language="0" /&gt;
  &lt;/DirectoryRef&gt;
  </code></pre>
  
  <p>and I've referred these merge modules as:</p>
  
  <pre><code>&lt;Feature Id="ProductFeature" Title="Title" Level="1"&gt;
    &lt;ComponentRef Id="VSPackage"/&gt;
    &lt;ComponentRef Id="ApplicationShortcut"/&gt;
    &lt;ComponentRef Id="DesktopShortcut"/&gt;
    &lt;ComponentRef Id="LicenseComp"/&gt;
    &lt;MergeRef Id="MergeModuleID1"/&gt;
    &lt;MergeRef Id="MergeModuleID2"/&gt;
  &lt;/Feature&gt;
  </code></pre>
  
  <p>The problem I'm facing is, that my VSIX is installed to all the user accounts on the machine, but these merge modules are not, they're installed only on the user account where the product is installed. On other user accounts, an installation dialog appears, which I believe is installing these merge modules, after which everything works fine. 
  How do I make these merge modules to be installed to all users?</p>
  
  <p>P.S: ALLUSERS property in both the MSI and merge modules are set to '1'.</p>