pkg/fileutil/dir_windows.go
func OpenDir(path string) (*os.File, error) {
	fd, err := openDir(path)
	if err != nil {
		return nil, err
	}
	return os.NewFile(uintptr(fd), path), nil
}
func OpenDir(path string) (*os.File, error) {
	fd, err := openDir(path)
	if err != nil {
		return nil, err
	}
	return os.NewFile(uintptr(fd), path), nil
}
// OpenDir opens a directory in windows with write access for syncing.