Probably the easiest way to edit files with this tool is to right-click the file and choose Edit with Notepad++ from the context menu. While each tab represents its own file, the program can interact with all of them at once to do things like compare files for differences and search for or replace text. This program uses tabbed browsing, which means several documents remain open at a time and they'll display at the top as tabs. It’s really easy to use for beginners who just need a text file opener or editor but also includes some really advanced features.
Notepad++ is an excellent alternative notepad application for Windows computers.