How do you overwrite .txt files?

[roman dude]

Hi, I just did something dumb and downloaded an update to the EB Trivial Script from another thread here so I could watch an AI-only game, and apparently it isn't compatible with the alex.exe mini mod pack because it now it keeps trying to open EB with rome.exe and not alex. Unless someone can tell me how to get the Trivial Script to run EB off of alex again and not rome, I'm just gonna do a re-install. I made backups of some of the .txt files that I have edited and put them in a different folder for safekeeping, but I don't know how to overwrite the vanilla text files with mine after I do the re-install. I tried to copy/paste, but when I copy the text file there is no option to paste it on another, and when I try to just drag and drop it just puts the text file behind the one I want to be overwritten. I only have regular notepad as I have no idea how to work notepadd++ (i didn't even know which one to download lol), so does anyone know of a way to overwrite the text files? Sorry if this is a stupid/noob question, thanks for your time!

Update: I got EB running off of alex again, so now I would just like to know how to overwrite text files. Thanks!