title: Libraries to verify file format by header
body: <p>A few times in the last couple months I had the same task of verifying the file format by it's header: JPEG, PDF, Word, and other popular files.</p>
  
  <p>I wonder if there is a library availble for C#/.Net to do that? 
  Or is it a time to start a small project for NuGet catalogue?</p>