Queries whether the plug-in can be uninstalled.
EP_QUERY_UNINSTALL
hwnd = hwndParent;
wParam = 0;
lParam = 0;
hwndParent
The window handle of the Plug-ins Settings dialog box.
If the plug-in can be uninstalled, the return value is TRUE. If the plug-in cannot be uninstalled, the return value is FALSE.
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