What you see in a file browser is not necessarily related to what a file is served as (the response header mime type). Linux, and your server is a Red Hat distro, does not care about the extension; the "." is just another character. I imagine it's Filezilla that doesn't know what the ico extension is. In Debian, all applications that need to know the MIME type of a file reference /etc/mime.types for the info. From your response header for /favicon.ico, Apache does know the proper MIME type.
Originally Posted by scampsall
Date: Wed, 21 Sep 2011 17:21:47 GMT
Server: Apache/2.2.17 (Unix) mod_ssl/2.2.17 OpenSSL/0.9.8e-fips-rhel5 mod_bwlimited/1.4
Last-Modified: Wed, 21 Sep 2011 08:15:26 GMT