This particular behavior sounds more like a bug than an explicit design decision. Do I have other "invisible" files around that I can't see? Most system files

This particular behavior sounds more like a bug than an explicit design decision. Do I have other "invisible" files around that I can't see? Most system files in Windows are hidden. I think it's an effort to prevent users from deleting some important system file, either accidentally or because they read on some website that it's a virus.