title: How can I compare .dsql (Azure SQL DW and PDW) files in Visual Studio 2015?
body: <p>If I invoke the file diff tool in Visual Studio 2015 on a text file with extension .dsql (Azure SQL DW and PDW SQL script) I get the error: </p>
  
  <blockquote>
    <p>Error occurred during difference operation: Cannot execute the configured tool</p>
  </blockquote>
  
  <p>Diff works as expected for other text file extensions.</p>
  
  <p>Visual Studio Professional 14.0.25431.01 Update 3 using VSTS source control.</p>