tell Apache to parse ALL (default) files as mod_ruby?

I like for my webroot files not have an extention.
Maybe the HTML is generated by PHP today, but Ruby tomorrow.

In PHP, to do this, I change my DefaultType in httpd.conf 

DefaultType application/x-httpd-php

Is there a way to make the DefaultType go through mod_ruby?

To be clear, I want files like:
http://www.mydomain.com/myfile
... to make HTML generated by mod_ruby
... and not have to name it like:
http://www.mydomain.com/myfile.rbx