Sidney,
You ran into a request made by the code red virus, that will happen quite often. If you for example do: "cat /var/log/httpd/access.log | grep -c default.ida"
you will see the amount of requests for this file in the acceslog.
As far as i know this is absolutely of no harm to apache on linux, it just doesn't find its way in. A fix for this isn't there, if you find one i expect there some people who will want to talk to you....
kind regards
Frank