As already noted by Richard, this can't be simply done if there is no method provided like for the Explorer. I will try to explain how context menus are handled: When clicking the right mouse button, the window under the mouse cursor will get a WM_CONTEXTMENU message. When pressing the context menu button on the keyboard (commonly left of the right ctrl key), the window which has the focus will receive this message. The WM_CONTEXTMENU handler will then create and show the menu. This is usually done by loading it from resources. But the complete menu or portions may be also created dynamically by code. It is also common practice to modify resource based menus dynamically according the current context (gray out, remove, add, or change items and sub menus). To modify a menu, you must know the handle that is assigned upon menu creation (with resource based menus the handle of the sub-menu because that contains the items). If you want to insert new items, you must also know about the existing items (order, position, sub menus, separators). If you really want to try it, you must hook the API functions CreateMenu(), CreatePopupMenu(), and TrackPopupMenu[Ex](). But I'm not sure if this will work.
