C# WinForms Application Full Integration with HTMLHelp ( .chm ) - Help Topics, Context Sensitive Help, and Tooltips

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.VisualStudio.OLE.Interop;

namespace WinHelpLib
{

    enum STGTY
    {
        STGTY_STORAGE = 1,
        STGTY_STREAM = 2,
        STGTY_LOCKBYTES = 3,
        STGTY_PROPERTY = 4
    };

    enum STREAM_SEEK
    {
        STREAM_SEEK_SET = 0,
        STREAM_SEEK_CUR = 1,
        STREAM_SEEK_END = 2
    };


    enum STATFLAG
    {
        STATFLAG_DEFAULT = 0,
        STATFLAG_NONAME = 1,
        STATFLAG_NOOPEN = 2
    };

    class IDocFileEx
    {
        public const int S_OK = 0x00000000;
        public const int S_FALSE = 0x00000001;

        public const int STGM_READ = 0x00000000;
        public const int STGM_WRITE = 0x00000001;
        public const int STGM_READWRITE = 0x00000002;
        public const int STGM_SHARE_DENY_NONE = 0x00000040;
        public const int STGM_SHARE_DENY_READ = 0x00000030;
        public const int STGM_SHARE_DENY_WRITE = 0x00000020;
        public const int STGM_SHARE_EXCLUSIVE = 0x00000010;
        public const int STGM_PRIORITY = 0x00040000;
        public const int STGM_CREATE = 0x00001000;
        public const int STGM_CONVERT = 0x00020000;
        public const int STGM_FAILIFTHERE = 0x00000000;
        public const int STGM_DIRECT = 0x00000000;
        public const int STGM_TRANSACTED = 0x00010000;
        public const int STGM_NOSCRATCH = 0x00100000;
        public const int STGM_NOSNAPSHOT = 0x00200000;
        public const int STGM_SIMPLE = 0x08000000;
        public const int STGM_DIRECT_SWMR = 0x00400000;
        public const int STGM_DELETEONRELEASE = 0x04000000;


        public static IStorageEx Open(string sName)
        {
            try
            {
                ITStorage itss = (ITStorage)(new ITStorageCoClass());
                IStorage iSt = itss.StgOpenStorage(sName, new IntPtr(0), STGM_READ, new IntPtr(0), 0);
                if (iSt != null)
                {
                    return new IStorageEx(iSt);
                }
            }
            catch
            {
            }
            return null;
        
        }

    }
}