I am using Nginx on Ubuntu to host a Wordpress site and everything is working great except certain file types return the Nginx 404 rather than the Wordpress template 404.
For example: http://www.sbbic.org/something.zip shows the Nginx 404 page.
While http://www.sbbic.org/2014/06/17/free-english-khmer-dictionary-mac-osx-download2 shows the template 404 page.
What am I missing in my configuration of Nginx?