title: Are all JPEG files JFIF?
body: <p>Active Directory can store images in JPEG File Interchange Format (JFIF) according to the <a href="http://msdn.microsoft.com/en-us/library/ms676813(VS.85).aspx" rel="noreferrer">jpegPhoto Attribute definition</a>.  I'd like to use this but I'd never heard of JFIF.</p>
  
  <p>First, are all JPEG files JFIFs?  </p>
  
  <p>Second, does a WPF JpegBitmapEncoder produce a JFIF file?  I guess if the first is true, this will be but if it's not...?</p>