Ryan

Create plain text files through WordPress using a custom post type.
This came about because I needed a way to edit a JavaScript file on a blog that’s 
part of a multi site network setup, and I didn’t want to do a child theme for 
just that one blog and keep up with updating the JS through FTP. This way I can 
edit it directly inside of WordPress as I need to without firing up Notepad++ or 
FileZilla.
If you select either CSS or JavaScript as the file type you’ll have the option 
for the plugin to automatically link to the file within your page header, assuming 
your theme supports the wp_head callback. The links are created using either 
 wp_register_script / <code>wp_enqueue_script</code> or <code>wp_enqueue_style</code> / <code>wp_enqueue_style</code>.
And a thank you goes out to Ted Devito for his 
<a href="http://teddevito.com/demos/textarea.html" rel="nofollow ugc">Tabby jQuery plugin</a> that allows 
the capture of tabs inside the edit text area.

Plain Text Custom Post Type

Adds a custom post type for plain text files that can be used for JavaScript or CSS.

George Pattichis

Simple CPT is a free WordPress plugin that lets you create custom post types and custom taxonomies (eg: categories, tags, etc.) directly from your admin dashboard without writing a single line code.
No more editing files manually. With Simple CPT you can create a new Custom Post Type in less than 1 minute.
This plugin is written using only native functions, included in WordPress core, so it does not in any way reduce the performance of your website and will not cause any compatibility problems. Simple CPT is completely free, it will save you time and it is compatible with almost all themes and plugins out there.
In just a few minutes you can adapt your WordPress site to any type of project in a professional and extremely efficient way, e.g. ecommerce, hotel, restaurant, events, portfolio, community websites etc.

Simple CPT

Simple CPT provides an easy to use interface for registering and managing custom post types and custom taxonomies.

Plain Text Custom Post Type vs Simple CPT