When I save a Mathematica notebook using the front-end Save dialog, I can specify the format:

However, the documentation for the NotebookSave command indicates only that
NotebookSave[notebook, "file"]saves the notebook in the specified file
Is there a way to specify the format when using NotebookSave, like I can when using the visual save dialog? I use Mathematica 9.
NotebookSave[EvaluationNotebook[], "file.nb", Interactive -> True]is not what you want? $\endgroup$