That makes it even more odd. Since the rest of the text on the menu (everything but the mouse over), is in a completely different place: Theme part details/Explorer style Me/Button/Text. At least, that's the only way I know how to change that non-mouseover menu text. I guess, there's no easy way to group shared items.
It would be great if one day they make an elaborate WYSIWYG Windows GUI sandbox within Skinstudio where we could just click on any Skinstudio-modifiable item; and, Skinstudio takes you directly to where you can change it. I think this is how Skinstudio should have been like in the first place. I'm guessing it might be too difficult to implement; or, Stardock would have done it a long time ago.
Actually if you define an image for this area: Edit Explorer/IE Parts, Edit Additional Parts, View Menu Item, you can change the font color for that image in the Text settings. That is the mouseover image for that area.