Depending on your set up, you might be need to tell the web server not to pass this particular file to the FCGI setup for RT. For example if you’re using Apache, instead of something like:
ScriptAlias / /opt/rt4/sbin/rt-server.fcgi/
DocumentRoot "/opt/rt4/share/html"
you might want to replace the ScriptAlias with a ScriptAliasMatch statement that has a regex that excludes this particular file.