Sometimes we receive emails from Syncplify.me Notepad! users, asking how to make Notepad! the default program to handle text (.txt) files in Windows.
The following 3 screenshot are a practical walkthrough that shows you how to do it in a clean way:
A more radical approach is to use Notepad Replacer, a tiny freeware tool, that can automatically tweak your registry to associate all files currently handled by your Windows Notepad with the program of your choice. You can download Notepad Replacer here.