if err != nil {
		return "", false
	}
	n := uint32(100)
	for {
		b := make([]uint16, n)
		n, err = GetEnvironmentVariable(keyp, &b[0], uint32(len(b)))
		if n == 0 && err == ERROR_ENVVAR_NOT_FOUND {
			return "", false
		}
		if n <= uint32(len(b)) {
			return UTF16ToString(b[:n]), true
		}
	}
}

func Setenv(key, value string) error {
	v, err := UTF16PtrFromString(value)
	if err != nil {

	ERROR_INSUFFICIENT_BUFFER Errno = 122
	ERROR_MOD_NOT_FOUND       Errno = 126
	ERROR_PROC_NOT_FOUND      Errno = 127
	ERROR_DIR_NOT_EMPTY       Errno = 145
	ERROR_ALREADY_EXISTS      Errno = 183
	ERROR_ENVVAR_NOT_FOUND    Errno = 203
	ERROR_MORE_DATA           Errno = 234
	ERROR_OPERATION_ABORTED   Errno = 995
	ERROR_IO_PENDING          Errno = 997
	ERROR_NOT_FOUND           Errno = 1168
	ERROR_PRIVILEGE_NOT_HELD  Errno = 1314

	ERROR_RELOC_CHAIN_XEEDS_SEGLIM                                            syscall.Errno = 201
	ERROR_INFLOOP_IN_RELOC_CHAIN                                              syscall.Errno = 202
	ERROR_ENVVAR_NOT_FOUND                                                    syscall.Errno = 203
	ERROR_NO_SIGNAL_SENT                                                      syscall.Errno = 205

		{"ERROR_ACCESS_DENIED", Const, 0},
		{"ERROR_ALREADY_EXISTS", Const, 0},
		{"ERROR_BROKEN_PIPE", Const, 0},
		{"ERROR_BUFFER_OVERFLOW", Const, 0},
		{"ERROR_DIR_NOT_EMPTY", Const, 8},
		{"ERROR_ENVVAR_NOT_FOUND", Const, 0},
		{"ERROR_FILE_EXISTS", Const, 0},
		{"ERROR_FILE_NOT_FOUND", Const, 0},
		{"ERROR_HANDLE_EOF", Const, 2},
		{"ERROR_INSUFFICIENT_BUFFER", Const, 0},
		{"ERROR_IO_PENDING", Const, 0},

pkg syscall (windows-386), const ERROR_ALREADY_EXISTS Errno
pkg syscall (windows-386), const ERROR_BROKEN_PIPE Errno
pkg syscall (windows-386), const ERROR_BUFFER_OVERFLOW Errno
pkg syscall (windows-386), const ERROR_ENVVAR_NOT_FOUND Errno
pkg syscall (windows-386), const ERROR_FILE_EXISTS Errno
pkg syscall (windows-386), const ERROR_FILE_NOT_FOUND Errno
pkg syscall (windows-386), const ERROR_INSUFFICIENT_BUFFER Errno

pkg syscall (windows-386), const ERROR_ALREADY_EXISTS = 183
pkg syscall (windows-386), const ERROR_BROKEN_PIPE = 109
pkg syscall (windows-386), const ERROR_BUFFER_OVERFLOW = 111
pkg syscall (windows-386), const ERROR_ENVVAR_NOT_FOUND = 203
pkg syscall (windows-386), const ERROR_FILE_EXISTS = 80
pkg syscall (windows-386), const ERROR_FILE_NOT_FOUND = 2
pkg syscall (windows-386), const ERROR_INSUFFICIENT_BUFFER = 122