It is only an (C#) example of how to process a lot of files using the Backgroundworker component.
Uses the Windows API to enumerate files because for this purpose I think it works better than .NET functions. Also shows you how to cancel the process correctly if the form is closed, and some things more.
It is a an WinForms application , but the Backgroundworker component can also be used in AutoCAD with a modal form.
The application is just one example, does not alter any file.
I'm not a programmer and I've never read any book about programming, but I think it is a good example
The project must be compiled before opening the main form. Usually, if you see this icon you must compile before opening a form to avoid errors