title: Opening existing project in Visual Studio 2010
body: <p>All,</p>
  
  <p>I have a project that was originally written in vs 2005 or earlier (don't remember bc I didn't write it).  I opened it in vs2008 and converted it although it still has the csproj file.  sln file states:</p>
  
  <p>Microsoft Visual Studio Solution File, Format Version 10.00</p>
  
  <h1>Visual Studio 2008</h1>
  
  <p>Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "foo", "foo.csproj", "{BF9BAC88-C507-404D-928C-BC08193F5CCD}"
  EndProject</p>
  
  <p>I have worked with the project many times in vs2008 without any problem.</p>
  
  <p>Now I am running vs2010 on a virtual machine and want to open this project in it.  However, when I try I get the "cannot be opened because its project type .csproj is not supported by this version of the application" error.  Main solution files are foo.sln, foo.csproj, and foo.csproj.user (in addition to code files).  I am somewhat confused as I thought using it in vs2008 (and going through the initial conversion) would make the jump to vs2010 painless.</p>
  
  <p>What am I missing?  All my searches end up with the same few posts about converting projects in 2008.</p>
  
  <p>Thanks!</p>