Mod talk:TConfig/@comment-4360793-20120806001316/@comment-4674838-20120901024945

Actually, most content packs are built on top of tConfig. So even if it makes the files different, tConfig is anything but useless, because everybody modding Terraria builds their mods for tConfig.

As far as changing the files back, I'm not sure. But it goes without saying that you should obviously backup your files before using 3rd party applications or mods... that way you can revert to your backup when you want.