mouse4 and mouse5 on Windows are called xbutton1 and xbutton2
You can use them:
mouse_event(MOUSEEVENTF_XDOWN, NULL, NULL, XBUTTON1, NULL); mouse_event(MOUSEEVENTF_XDOWN, NULL, NULL, XBUTTON2, NULL); mouse_event(MOUSEEVENTF_XUP, NULL, NULL, XBUTTON1, NULL); mouse_event(MOUSEEVENTF_XUP, NULL, NULL, XBUTTON2, NULL);
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