Apache2 / ruby question

I can get apache2 to execute .rbx files, but I can't get it to execute .rb files. Here is
the relevant part of my httpd.conf:

<IfModule mod_ruby.c>
        # for Apache::RubyRun
        RubyRequire apache/ruby-run
        <FilesMatch "\.(rbx|rb)$">
                Options +ExecCGI
                SetHandler ruby-object
                RubyHandler Apache::RubyRun.instance
        </FilesMatch>

        # handle *.rhtml as eruby files.
        RubyRequire apache/eruby-run
        <FilesMatch "\.rhtml$">
                SetHandler ruby-object
                RubyHandler Apache::ERubyRun.instance
        </FilesMatch>

        # debug
         RubyRequire auto-reload
</IfModule>

Why don't .rb files execute?

Aso, I can get embedded ruby to work in .rhtml files, but not .html files. Is there a way that I can
get that to work?

thanks,
Ralph