You can not simply change the extension of the file and
modify some code to get it to work. You also need a CFML
application server.
ColdFusion / CFML can work with many databases including
MySQL, but NOT with PHPMyAdmin. I'm afraid the clue is in the name.
PHPMyAdmin is built for PHP. There was a CFMyAdmin a long while
ago, but I think that project has been abandoned. I think there are
paid for version around if you're interested.
Please see this blog post which might help:
http://www.cfdan.com/posts/MySQL_Database_tools_-_Navicat,_Toad_and_CFMyAdmin.cfm
Good luck,
Mikey.