CFAjaxProxy - don't add the .CFC file extension...

I've been getting the following CF error when attempting to use the CFAjaxProxy tag:

The specified CFC path.to.cfcname.cfc cannot be found

The specified CFC definitely existed, and all the mappings had been set up correctly.

I was calling it with the following code:

I was tearing my hair out for about an hour, before I realised think CF not AJAX - the path to be supplied is in exactly the same format as all CFC references - i.e. excluding the .CFC file extension.

I'm sure this is completely obvious to most people (although at least one guy (thanks Andy) mentioned having done the same thing even today) - but its the obvious ones that seem to catch me out!!!