title: wix guid using rules
body: <p>For example I have:</p>
  
  <pre><code>    &lt;Component Id='MainExecutable' Guid='0436E0CA-8612-4330-A70D-642910D9F19A'&gt;
        &lt;File Id='FoobarEXE' Name='FoobarAppl10.exe' DiskId='1' Source='FoobarAppl10.exe' KeyPath='yes'&gt;
        &lt;/File&gt;
      &lt;/Component&gt;
  </code></pre>
  
  <p>If then I create an update package should I use the same GUID for component that include FoobarEXE? I know rule for Product, UpgradeCode etc but what is the rule for other GUIDs? What is their scope?</p>