title: WIX Autogenerate GUID *?
body: <p>Let's say I generate my WIX XML file with a Product Id of *.  Also for each Component GUID I use a *.</p>
  
  <pre><code>  &lt;Product Id="*" Name="xxx" Language="1033" Version="1.0.0.0" Manufacturer="xxx" UpgradeCode="xxx"&gt;
  </code></pre>
  
  <p>Behind the scenes is the * spinning a unique GUID each time I compile my WIX Installer?  Let's say I have version 1.0.0 installed a machine.  Then I recompile my WIX Installer to version 1.0.1.  </p>
  
  <p>When I go to install 1.0.1 how does WIX know that 1.0.0 is already installed and thus will remove all files/registry entries and install 1.0.1?</p>
  
  <p>Should I be using * from GUID or should I have a unique ID/GUID in my WIX XML configuration?</p>