As seen below, Customize format window is brought up by pressing Additional settings... button in Region control panel which can be open using command control intl.cpl.
Is there a way to programmaticaly open Customize Format window?
(Even a workaround counts.)
My goal: Send user from my application settings directly to place where they can view/customize accepted digit format (comma, thousands separator etc.). Allows users to learn that there are centralized Windows settings for this.
It looks like this primary MSDN source for opening control panels forgot about Region control panel at all.
The only possible workaround I can think of is by programmatically listing child controls of of Region control panel window and then identifying and pressing Additional Settings button. Doesn't look like easy task, but doable, as seen at screen with readers accessibility software.