title: Open two files for comparison
body: <p>From Solution Explorer, I'd like to select two C# code files for textual comparison. I have got <strong>WinMerge</strong> installed on my machine, which accepts multiple file names on the command line. So I tried to use <strong>Open With...</strong> command and add WinMerge to the list of existing options. The problem however is that I don't know what to write in the <strong>Arguments</strong> textbox. Setting it to <strong>%1</strong> simply sends the first selected file to WinMerge. <strong>%2</strong> is not recognized by VS and is literally pasted into WinMerge.</p>
  
  <p>What is the correct syntax to send two files?</p>