I wrote this App using AutoHotkey for fast and easy changing of folder icons thur a quick and simple GUI.
Github download link at the bottom of the post.
It was written with using the .ico format in mind. You can push .dlls through it, but the dll support is limited and i don't plan on developing that any further.
I got tired of wasting time clicking thur the 3 sets of windows and buttons that windows makes you jump through to set a custom folder icon from the folders properties window.
I have posted about this before and here. Then after a year of playing with AHK i found the magic combination to make this simple and made a GUI for it.
I posting about this here because i tapped into Dopus great ability to to use dopusrt to view and load active tabs into the gui for speed and convivence! Thank you dopus team! Any one can use this but these dopus menus only appear when the dopusrt.exe path is set in the settings.
Its lightweight and changes no system files or settings except for the desktop.ini files that you tell it. Here's me installing it and change its own folder icon in about 30 seconds... 
It also has a handful of dynamic menus to make it quicker and easier to use, Live hotkeys being read form the settings file, save your history options, toggles for extra options, etc etc ...
How I use it inside of Dopus...
I use it combination with Dopus button for on-the-fly folder icon changes. Its on my tool bar and context menu (for folders only)
@disablenosel:dirs
@dirsonly
@nodeselect
Clipboard COPYNAMES=unc
@async:"C:\Users\<YourUsername>\Update the path to\Change Folder ICO.exe"
// important update the path to where you have this installed here.
This button will copy the full folder path, then run Change Folder ICO.exe.
Then inside my app I keep the option to "Automatically check Clipboard on Startup" turned on. It will find the folder path in your clipboard and load it automatically.
Provide it an a path to .ico file and click Set New Icon! Simple! it will write the icon path into that folders desktop.ini and apply the attributes that windows looks for to change the folder icon.
To Download
You can download it from the Releases page on its Github Webpage.
I hope some of y'all check it out and find it useful!
-Xavier