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There are some basic rules on which windows go into the taskbar. Raymond Chen has summarized these rules more precisely here. As an alternative, you can create a hidden window and make this hidden window the owner of your visible window. To prevent the window button from being placed on the taskbar, create the unowned window with the WS_EX_TOOLWINDOW extended style. To ensure that the window button is placed on the taskbar, create an unowned window with the WS_EX_APPWINDOW extended style. The Shell creates a button on the taskbar whenever an application creates a window that isn't owned. Neither Windows 8 nor Windows 10 changed that fundamental rule they only changed the appearance of the previews.Īs such, we can refer back to the MSDN documentation for the rules about which windows appear on the taskbar: Then, in Windows Vista, it became possible to display previews of these open windows when you hovered over the corresponding taskbar button. Starting in Windows XP, taskbar grouping became an option, so that all eligible windows from a single application could be grouped together and appear as a single button on the taskbar.

A long time ago, say in Windows 2000, each of an application's eligible windows would just appear as buttons on the taskbar. In my understanding, borne out by my empirical tests, the windows that appear in the taskbar previews are exactly the same windows that would ordinarily appear in the taskbar.