: the file extension of the content file (e.g., `md`); this can also be called using `.File.Extension` as well. Note that it is *only* the extension without `.`.
.File.Lang
: the language associated with the given file if Hugo's [Multilingual features][multilingual] are enabled (e.g., `en`)
.File.Dir
: given the path `content/posts/dir1/dir2/`, the relative directory path of the content file will be returned (e.g., `posts/dir1/dir2/`). Note that the path separator (`\` or `/`) could be dependent on the operating system.