I am working on a Drupal site with some PDF files where I am opening a PDF file in a new window. The files are getting opened in the browser with the Acrobat Reader plugin but the favicon is not getting displayed. What should be done to show the favicon?
If you show the PDF file in an iframe, the browser should show the site-wide favicon, but you're out of luck in an external applications. Acrobat Reader doesn't use Favicons.
UPDATE This is now possible by placing favicon.ico in the root directory of your website as per @s1m0n1stv4n answer below