Problem:

When trying to change CKEditor style in ‘Custom Editor Options’ by choosing an existing file, dropdown list shows only .js files.
(Custom Editor Options => Editor Styles => List of available styles => File)

BUT

By default, DNN File Manager doesn’t allow users to view/upload .js files. Enabling this option may lead to security breach.

Suggested solution:

Please allow also .txt files to be shown in dropdown list along with .js files.