(longopts): Add --wow64 option.
(opts): Add -w option.
(wow64): New variable to control usage of KEY_WOW64_64KEY access flag.
(usage): Add text for --wow64/-w option.
(print_version): Fix copyright.
(find_key): Use wow64 value in calls to RegOpenKeyEx and RegCreateKeyEx.
(cmd_add): Use wow64 value in call to RegCreateKeyEx.
(regDeleteKeyEx): New function pointer to load RegDeleteKeyEx function
dynamically.
(cmd_remove): Load and use regDeleteKeyEx when wow64 is set.
(main): Handle --wow64/-w option.
* utils.sgml: Document the new -w option.