title: Subversion - Compare two text files with custom extension
body: <p>Good Day,</p>
  
  <p>I'm using an application that stores functions in a custom file extension (.mts).</p>
  
  <p>For example I have subroutines located in functions.mts.  I'm using Subversion to store the changes made over the lifetime of this project.</p>
  
  <p>Is there a way to customize Subversion so that I can diff the two files as if I was using C#?</p>
  
  <p>TIA,</p>
  
  <p>coson</p>