It is called Find And Replace, and it is freeware and works well on Windows 11 and Windows 10 computers. You can select a folder where you have placed all the text files and search for a specific ...

This is how you can find and replace Text in Notepad on Windows 11/10. You can even replace multiple texts at once in Notepad by following this trick.

Enumerating files in a folder Opening files for reading and writing How to strip the first four characters from a string I'm not at a Windows PC right now so I can't test anything myself just yet ...