title: InstallShield prq attribute values?
body: <p>I'm creating .prq files to bundle software with a .NET application, but I'm having very inconsistent results with the prerequisite install prompt from machine to machine.  </p>
  
  <pre class="lang-xml prettyprint-override"><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;SetupPrereq&gt;
      &lt;conditions&gt;
          &lt;condition Type="16" Comparison="2" Path="[WindowsFolder]" FileName="dmcl.ini" ReturnValue=""&gt;&lt;/condition&gt;
      &lt;/conditions&gt;
      &lt;files&gt;
          &lt;file LocalFile="&amp;lt;ISProductFolder&amp;gt;\SetupPreRequisites\Redistributables\dfcWinSuiteSetup.exe" FileSize="0,0"&gt;&lt;/file&gt;
          &lt;file LocalFile="&amp;lt;ISProductFolder&amp;gt;\SetupPreRequisites\Redistributables\bofciSetup.jar" FileSize="0,0"&gt;&lt;/file&gt;
          &lt;file LocalFile="&amp;lt;ISProductFolder&amp;gt;\SetupPreRequisites\Redistributables\bofsubscriptionSetup.jar" FileSize="0,0"&gt;&lt;/file&gt;
          &lt;file LocalFile="&amp;lt;ISProductFolder&amp;gt;\SetupPreRequisites\Redistributables\bofworkflowSetup.jar" FileSize="0,0"&gt;&lt;/file&gt;
          &lt;file LocalFile="&amp;lt;ISProductFolder&amp;gt;\SetupPreRequisites\Redistributables\dfcWinSetup.jar" FileSize="0,0"&gt;&lt;/file&gt;
          &lt;file LocalFile="&amp;lt;ISProductFolder&amp;gt;\SetupPreRequisites\Redistributables\dfcWinSuiteSetup.jar" FileSize="0,0"&gt;&lt;/file&gt;
          &lt;file LocalFile="&amp;lt;ISProductFolder&amp;gt;\SetupPreRequisites\Redistributables\jdkwin131_04setup.jar" FileSize="0,0"&gt;&lt;/file&gt;
      &lt;/files&gt;
      &lt;execute file="dfcWinSuiteSetup.exe" cmdline="" cmdlinesilent=""&gt;&lt;/execute&gt;
      &lt;properties Id="{0278E528-E72C-439F-AE2A-BEFCB27EA9A3}" Description="This prerequisite installs the DFC for window setup" AltPrqURL=""&gt;&lt;/properties&gt;
      &lt;behavior Reboot="2"&gt;&lt;/behavior&gt;
  &lt;/SetupPrereq&gt; 
  </code></pre>
  
  <p>In particular, what are the potential values of Type and Comparison attributes?  Is there any documentation on this?</p>