You can use the ColdFusion method Application.cfc onMissingTemplate()to achieve this effect. If you want to have extensions other than .cfm, you will need to do some web server configuration to force ColdFusion to serve other extensions and directory paths (for example /path/to/something/), you need to set up a standard default document (for example, index.cfm). Ben Nadel has a blog post that covers this idea widely - be sure to check the comments.
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