title: VS 2010 Error: ...csproj Cannot Be Opened
body: <p>I'm trying to launch a project created by someone else in my local environment.  I'm currently using the following products:</p>
  
  <ul>
  <li>Visual Studio 2010 Ultimate version 10.0.40219.1 SP1 Rel</li>
  <li>MVC 2</li>
  <li>Windows 7 Ultimate</li>
  </ul>
  
  <p>But when I double click on the .sln file I get the following error:</p>
  
  <p><em>C:\Users...\Desktop\ContactManager\ContactManager\ContactManager.csproj : error  : The project file 'C:\Users...\Desktop\ContactManager\ContactManager\ContactManager.csproj' cannot be opened.</em></p>
  
  <p><em>The project type is not supported by this installation.</em></p>
  
  <p>Please help me load my project.  :)</p>
  
  <p>Thank you,</p>
  
  <p>Aaron</p>