title: What is R60, R72, and MINE file?
body: <p>I was building a DataAccessLayer using C# in VS 2012, and in my project, there are three files which I don't know how to deal with.</p>
  
  <pre><code>DataAccessLayer.csproj.mine
  DataAccessLayer.csproj.r60
  DataAccessLayer.csproj.r72
  </code></pre>
  
  <p>What are they? How should I deal with them? </p>