How do I set the AutoHotkey MsgBox taskbar icon?

I have some hotkeys in a script with a custom tray icon.

Menu Tray, Icon, my_hotkeys.ico

One of them shows a message box with an OK button and question mark icon.

MsgBox, 32, My Hotkeys, Hey, here's some info...

But, it has the default green H AutoHotkey image in the Windows taskbar. I've looked through all the Menu options. And the GUI command claims that it uses the Menu icon, if set. But I can't find anything specific to MsgBox. Is there any way to change the MsgBox icon to the same custom icon that I'm using in the system tray?

Solution

There are several possible solutions:

Create and show a Gui with +OwnDialogs before calling MsgBox.
Code your own MsgBox look-alike using the Gui commands.
Compile your script (convert to exe) with a custom icon.
Replace the icon resources in AutoHotkey.exe (affecting all scripts).
Set a timer before showing the MsgBox, then send WM_SETICON after it appears.
Hook creation of the MsgBox window to set the icon before the window is shown - example in C++.

+OwnDialogs example:

Menu Tray, Icon, shell32.dll, 5  ; Folder icon
Gui +OwnDialogs
Gui Show           ; Since it has zero dimensions, it should be invisible.
MsgBox Testing...
ExitApp