C# Definition:

public class Constants
{
     public const int MAX_PATH = 260;
     public const int MAX_ZONE_PATH = 260;
     public const int MAX_ZONE_DESCRIPTION = 200;
}

[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Unicode)]
public struct ZONEATTRIBUTES
{
     public uint cbSize;
     [MarshalAs(UnmanagedType.ByValTStr, SizeConst = Constants.MAX_PATH)]
     public string szDizplayName;
     [MarshalAs(UnmanagedType.ByValTStr, SizeConst = Constants.MAX_ZONE_DESCRIPTION)]
     public string szDescription;
     [MarshalAs(UnmanagedType.ByValTStr, SizeConst = Constants.MAX_PATH)]
     public string szIconPath;
     public uint dwTemplateMinLevel;
     public uint dwTemplateRecommended;
     public uint dwTemplateCurrentLevel;
     public uint dwFlags;
}

public enum URLZONEREG
{
     URLZONEREG_DEFAULT = 0,
     URLZONEREG_HKLM,
     URLZONEREG_HKCU
}

[Guid("79eac9ef-baf9-11ce-8c82-00aa004ba90b")]
[ComImport]
public interface IInternetZoneManager
{
     void CopyTemplatePoliciesToZone(uint dwTemplate, uint dwZone, uint dwReserved);
     void CreateZoneEnumerator(ref uint pdwEnum, ref uint pdwCount, uint dwFlags);
     void DestroyZoneEnumerator(uint dwEnum);
     void GetZoneActionPolicy(uint dwZone, uint dwAction, IntPtr pPolicy, uint cbPolicy,
     URLZONEREG urlZoneReg);
     void GetZoneAt(uint dwEnum, uint dwIndex, ref uint pdwZone);
     void GetZoneAttributes(uint dwZone, ref ZONEATTRIBUTES pZoneAttributes);
     void GetZoneCustomPolicy(uint dwZone, [In] ref Guid guidKey, ref IntPtr ppPolicy,
     ref uint pcbPolicy, URLZONEREG urlZoneReg);
     void LogAction(uint dwAction, [MarshalAs(UnmanagedType.LPWStr)] string pwszUrl,
     [MarshalAs(UnmanagedType.LPWStr)] string pwszText, uint dwLogFlags);
     void PromptAction(uint dwAction, IntPtr hwndParent, [MarshalAs(UnmanagedType.LPWStr)] string pwszUrl,
     [MarshalAs(UnmanagedType.LPWStr)] string pwszText, uint dwPromptFlags);
     void SetZoneActionPolicy(uint dwZone, uint dwAction, IntPtr pPolicy, uint cbPolicy,
     URLZONEREG urlZoneReg);
     void SetZoneAttributes(uint dwZone, ref ZONEATTRIBUTES pZoneAttributes);
     void SetZoneCustomPolicy(uint dwZone, [In] ref Guid guidKey, IntPtr pPolicy,
     uint pcbPolicy, URLZONEREG urlZoneReg);
}

VB Definition:

<ComImport> _
<Guid("TODO")> _
'TODO: Insert <InterfaceType(ComInterfaceType.InterfaceIsIUnknown)> _ if this doesn't derive from IDispatch
Interface IInternetZoneManager
   TODO
End Interface

User-Defined Types:

None.

Notes:

None.