C# Constants:

// Guids for 2 & 3 may be incorrect.

    public class GUIDs {
        public static Guid IID_IContextMenu  = new Guid("000214E4-0000-0000-C000-000000000046");
        public static Guid IID_IContextMenu2 = new Guid( 0x000214F4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 );
        public static Guid IID_IContextMenu3 = new Guid( 0xbcfce0a0, 0xec17, 0x11d0, 0x8d, 0x10, 0x0, 0xa0, 0xc9, 0xf, 0x27, 0x19);
    }

VB Constants:

TODO

Notes:

None.