title: Extract thumbnail for any file in Windows C#
body: <p>I need to extract a thumbnail for uploaded files like ppt, word files, images etc. I have implemented this (<a href="https://stackoverflow.com/questions/21751747/extract-thumbnail-for-any-file-in-windows">Extract thumbnail for any file in Windows</a>) answer but I am getting files with black background. On one machine it works on other it gives thumbnail with black background.
  <a href="https://i.stack.imgur.com/yDzw5.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/yDzw5.jpg" alt="Sample of thumbnail image obtained"></a></p>