At least, my Cygwin quickly complain there is sth wrong: % mkdir '//?/c:/test123 ' % ls ls: test123 : No such file or directory Still, ls work if test12

At least, my Cygwin quickly complain there is sth wrong: % mkdir '//?/c:/test123 ' % ls ls: test123 : No such file or directory Still, ls work if test123 is shadowed. % ls -d test123* test123/ test123 / But at least, you see it :)