A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
The font used in the dialog box is universal for all dialog boxes in Windows. You can change the font in the "Windows Color and Appearance" settings dialog; but, again, remember, this affects all of Windows and the applications that run on it.
Another option is to create your own dialog box by using a UserForm laid out the way you want and Show that wherever you would now call your current dialog box.