Superhidden file extensions

I'm just curious about what those extensions are. Why superhidden? Thanks

Extensions are those little three letter'd things at the end of a file EXE BAT TXT and so on and so forth They're hidden because if they're changed they can cause the program to not run, or run improperly

Thanks for the reply. I'm sorry if my q wasn't clear. I know about file extensions in general. I've just never ran into "supehidden" extensions before. I know about regular hidden extensions. What exactly are superhidden extensions?

I) A "really hidden" file/folder is one that cannot be seen in Windows Explorer after enabling it to "show all files," and cannot be seen in MS-DOS after receiving a proper directory listing from root. a) There is at least one workaround to enable Windows Explorer to see them. There is at least one workaround to enable MS-DOS to see them. II) Distinguishes "really hidden" file/folders from just plain +h[idden] ones, such as your "MSDOS.SYS" or "Sysbckup" folder. III) Distinguishes from certain "other" intended hidden files, such as a file with a name of "°ƒë‹x¥."