title: What is Composite Document File V2 Document?
body: <p>I need to write a script to find out if a given document is of the format .doc or not.
  Iam using Amazon Linux machine. I tried to make use of the linux file command.
  For a given doc file the file command outputs the file information as following:</p>
  
  <p><strong>sample_file.doc: Composite Document File V2 Document, No summary info</strong></p>
  
  <p>I found out that file command provides the same file type information for 2003 excel files (.xls).</p>
  
  <p>I want to know what all file types (like doc,xls) come under Composite Document File V2 Document and how I can check if given file is a doc file or not in Amazon Linux 2012 machine?</p>