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Asked: 2026-06-03T07:27:09+00:00

I’ve found this undocumented windows message, hex code: 0x0313 that’s sent when a user

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I’ve found this undocumented windows message, hex code: 0x0313 that’s sent when a user right-clicks on the app’s taskbar button. Is this stable to use/capture?

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  1. Editorial Team

    No guarantees, but in practice it will probably not disappear.

    I googled it just to make sure it’s not e.g. a documented MFC message.

    One result, from http://delphi.about.com/od/vclwriteenhance/a/ttaskbarmenu.htm:

    When you right-click on a taskbar button, Windows sends an undocumented message ($0313) to the corresponding application window. The WPARAM is unused (zero) and the LPARAM contains the mouse position in screen coordinates, in the usual format. By default, WindowProc handles this message by popping up the system menu at the given coordinates.

    Apparently you can use it to pop up your own custom menu, but before doing that I would use e.g. Spy++ to check whether possibly it generates documented messages that can be processed instead.

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