How to make different types of files opened by Notepad++ have different icons?

Question

Icons

All file types opened by Notepad++ have the same icon. How to make .txt and .cs file types have different icons? I change the icon for one type of file - the icons change for all files opened by Notepad++ .

Answer 1

Add a DefaultIcon for the
HKEY_CLASSES_ROOT\.extension\.cs file extension,
well, you can also install a second notepad++ and register these extensions on different notepads with different icons.
An icon in Windows is bound to either an application or an extension