title: Visual Studio 2010 forgets custom editor
body: <p>I'm using Visual Studio 2010 Version 10.0.30319.1 RTMRel.</p>
  
  <p>I'm also working with XAF (the application framework from DevExpress).</p>
  
  <p>I right-click a Model.xafml (XML) file, choose "Open With...", then choose "Automatic Editor Selector (XML)" in the "Choose the Program..." list.</p>
  
  <p>I click "Set as Default".  The default changes as expected.</p>
  
  <p>I click OK.  The XML file opens in the Model Editor (custom editor) as expected.</p>
  
  <p>I close the custom editor window.</p>
  
  <p>I then right-click the Model.xafml file and choose Open, expecting to see the custom editor I just set as the default.</p>
  
  <p>Doesn't work.  Instead, I see the raw XML file.</p>
  
  <p>If I right-click again and choose "Open With..." again, and see that the default editor has been set back to "Project Default Editor".</p>
  
  <p>It looks like Visual Studio has forgotten the default editor I just set.</p>
  
  <p>I am logged in to Windows Vista as an Admin.  I tried explicitly running VS as Admin, just in case there's a permissions problem writing the default.  Didn't help.</p>
  
  <p>Am I doing something wrong, or is there a bug in VS that prevents it from storing the default editor?</p>
  
  <p>I already Googled this question and found no results.</p>
  
  <p>Thanks in advance,</p>
  
  <p>Adam</p>