title: Difference between two files in terms of lines
body: <p>I have two huge files (file1 and file2). Both the files are organized into lines. I need to generate a third file file3 which has the lines that is there is file 1 but not in file 2. The lines are not ordered.</p>
  
  <p>What is the easiest (smartest) way to get it in Windows?</p>