title: How to preview an image with TFileOpenDialog
body: <p>Does anyone know how to display an image in the TFileOpenDialog preview?</p>
  
  <p>I am using ImageEn to display image information and to add additional file type support to the dialog.  For example... I can load image information about jp2, j2k and other files types not supported, but how to load an unsupported image type for preview using ImageEn.</p>
  
  <p>I am displaying image information in the dialog that works nicely, but I can not find any information about how to load an unsupported image into the PreviewHandler anywhere.  I can use ImageEnIO to get the file information as well as a bitmap of the image.</p>
  
  <p><img src="https://i.stack.imgur.com/q6ab6.png" alt="TFileOpenDialog"></p>
  
  <p>Does TFileOpenDialog use a preview handler to display the image or is some other way needed?</p>
  
  <p>I am sorry I do not have code to show for displaying the image, but I do not know how to implement it.</p>
  
  <p>Rodrigo commented on Hosting Preview Handlers in Delphi VCL Applications. that the windows explorer does not use a preview handler to preview the images... so I assume the TFileOpenDialog uses the same API as Windows Explorer, but I am not even sure of this. <a href="http://theroadtodelphi.wordpress.com/2013/05/24/hosting-preview-handlers-in-delphi-vcl-applications/" rel="noreferrer">http://theroadtodelphi.wordpress.com/2013/05/24/hosting-preview-handlers-in-delphi-vcl-applications/</a></p>
  
  <p>If this question is too broad to be accepted here I will delete the question.</p>