BUG: Explorer, can't rename a folder to ".config"

Found a bug in Explorer:

you cannot create a new folder and name it ".config" (w/o quotes, of
course)

Also exists on XP.

--
-Gernot
int main(int argc, char** argv) {printf
("%silto%c%cf%cgl%ssic%ccom%c", "ma", 58, 'g', 64, "ba", 46, 10);}