Microsoft Sans Serif!!!! Note that this is not the same as MS Sans Serif, which is a bitmap font (I beleive). Older versions of Windows use MS Sans Serif. I also don't know if there is a .Net function to find the user's specified font, or if the user can specify a default font. He can specify the menu font, title bar font, message box font, but I don't think he can specify a default control/window font.