I've been looking for a solution to my problem for a bit now, but I decided to turn to the community for help.
My WordPress blog is currently installed in the main directory of my website (under public_html). The site works fine and I'm pleased. Happiness.
Recently I took the opportunity to install another CMS into a subdirectory of my domain, though it's not anything associated with WordPress. In order to complete the installation, I need to open a file in a folder under that subdirectory. Even though it exists when I access the directory through FTP, I can't seem to open it in any browser. Firefox, IE, whatever -- I turn up the 404 error associated with my WordPress theme. Regardless of the theme I use, a 404 error appears for any file under this subdirectory.
I am growing frustrated because I can't find any way to convince WordPress not to consider this subdirectory a part of it. However, files under other subdirectories are just fine. I'm befuddled.
I have more experience doing frontend webdesign and overly technical responses will probably just further confuse me. Thank you in advance for any help, direction, or light you can shed on my question!