More 1.9.82 ...

It also includes a new method in winstl::reg_traits::reg_delete_tree(), which takes a key handle and a sub-key name, and deletes the sub-key and any/all its descendent keys, as in:

HKEY k = . . .

LONG res = winstl::reg_traits<char>::reg_delete_tree(k, "sub-key");

Use with care, because there's no un-delete!