Setting HTML tag defaults

Using robohelp 10 on win 7

Is there a way to change or set the HTML tag used by WYSIWYG "formatting" toolbar?

For example, when i click "bold" using the formatting toolbar it creates a span tag <span style="font-weight: bold;">

instead of simply using <b> tag.

I would like to change this attribute so the <b> tag is applied instead of <span>.