title: NSIS: find a registry key with wildcards
body: <p>The background for my issue is that I'm trying to move away from a Windows Installer system to NSIS. 
  During Installation Users are presented with a list of installed versions of my software and this should include the previous installs made with the Windows Installer system (one can then decide to install in parallel or replace a version).</p>
  
  <p>Now the registry keys for the Windows Installer based installations are in the shape</p>
  
  <pre><code>HKLM\Software\Microsoft\Windows\CurrentVersion\Uninstall\MySoftware12.18.12345
  </code></pre>
  
  <p>especially the last part <code>18.12345</code> depends on which previous version of my software was installed. 
  So I'm trying to find all keys starting with <code>MySoftware12.</code>
  Is this possible or am I approaching this wrong?</p>
  
  <p>cheers
  Markus</p>