title: EDMX doesn't show the UI designer - gets directly into the XML file
body: <p>I've reinstalled my laptop - Windows 7, VS2010, VS2010 SP1, SQL2008  and SQL2008 SP2.
  I've also done windows updates - no updates available from update window anymore</p>
  
  <p>The issue I've is: When I double click on the EDMX file it gets directly in to the XML. Why is that?
  I don't get any error....</p>
  
  <p>I can't do update from Database or add entities from Database etc.... </p>
  
  <p>I googled and found you should do open with and choose XML and then close XML and double click again. I've tried several options (open with ) and I don't get the UI Designer for my Entity Framework (edmx ) file.</p>
  
  <p>I clicked on the properties of the file (*.edmx)
  and I see Cusotmtool: EntityModelCodeGenerator and build action : EntityDeploy</p>
  
  <p>I then right clicked on EDMX and choose 'Run Custom Tool" and then I receive this error
  "cannot find custom tool 'EntityModelCodeGenerator' on this system."</p>
  
  <p>I checked VS2010 and VS2010 SP1 is installed. I did again install from DVD and choose REPAIR and I still have this problem.... </p>
  
  <p>so what could be problem?</p>
  
  <p>thanks</p>