title: Northwind.mdf - This database file is not compatible with the current instance of SQL Server (in Visual Studio 2017)
body: <p>I want to practice with some database that I want to use inside Visual Studio 2017.</p>
  
  <p>I had <code>Northwind.mdf</code> that I downloaded some time ago. But when I try to connect to it from VS2017 Servers panel, I get error message:</p>
  
  <blockquote>
    <p>This database file is not compatible with the current instance of SQL Server.</p>
  </blockquote>
  
  <p>Q1: Why?</p>
  
  <p>Q2: Where and how do I know the version of <code>Northwind.mdf</code>?</p>
  
  <p>Q3: Where and how do I know which version of database is supported by VS2017?</p>
  
  <p>Q4: I can create my own database in VS2017, but why I cannot use the existing database?</p>