Unable to download file

First, thanks for getting the server back up yesterday.

On my website (http://rrroberts.gi9.co/) there are several files users can download, including Pascal include files. Recently (just before server was down and today), when trying to download http://rrroberts.gi9.co/popup.inc , received message:
Forbidden

You don't have permission to access /popup.inc on this server.

Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request.

(Same issue with http://rrroberts.gi9.co/missle.inc ; other file extensions - *.for, *.pas, etc. seem OK)
I realize .inc is also the extension for PHP include files - is a new security setting a possible cause for this? I checked file access rights, they are OK.
Last week this was not an issue. Immediately after server reboot not an issue. Today an issue.

Do I need to make a change in my account settings, or something in .htaccess, or whatever? If so, please bear with me, I will need some help (please pardon my ignorance).

I am NOT using Wordpress (one of these days I will learn it), just plain old boring static HTML.

Thanks for any and all assistance.