HOW DO I: Associate file with no extension to a configuration?

For example I have a bunch of files without extensions that I want to treat as C++. I tried adding an empty extension to the list and it did not work. I added an extension with a single space and one with just a "." and same.

On a related issue: Is it possible to have an EmEditor config file in a folder that will set the extension types, etc. for that folder?

Both customizations are not possible directly (AFAIK), but instead you can write a macro that will run automatically on each opened file, analyze its path, name and extension and switch the current configuration to anything you need.