C# Definition:

[StructLayout(LayoutKind.Sequential)]
public struct PROPPAGEINFO
{
    public UInt32 cb;
    public IntPtr pszTitle;
    public SIZE size;
    public IntPtr pszDocString;
    public IntPtr pszHelpFile;
    public UInt32 dwHelpContext;
}

VB Definition:

   TODO

User-Defined Types:

SIZE

Notes:

Populate pszTitle, pszDocString and pszHelpFile using System.Runtime.InteropServices.Marshal.StringToCoTaskMemUni(string).