static extern int StgOpenStorageOnILockBytes(
			ILockBytes plkbyt,
			IStorage pStgPriority,
			STGM grfMode,
			IntPtr snbEnclude,
			uint reserved,
			out IStorage ppstgOpen);

 internal static extern uint StgOpenStorageOnILockBytes(
     ILockBytes lockbytes,
     IStorage pstgPriority,
     uint grfMode,               // access method
     IntPtr snbExclude,        // must be NULL
     int reserved,         // reserved
     out IStorage storage    // returned storage
     );

 public static extern int StgIsStorageILockBytes(ILockBytes plkbyt);

 public static extern int StgCreateDocfileOnILockBytes(ILockBytes plkbyt, STGM grfMode, uint reserved, out IStorage ppstgOpen);

 public static extern int CreateILockBytesOnHGlobal(IntPtr hGlobal, bool fDeleteOnRelease, out ILockBytes ppLkbyt);

 internal void Read(ILockBytes lb)
 {
     if (StgIsStorageILockBytes(lb) == 0)
     {
         IStorage storage = null;
         if (StgOpenStorageOnILockBytes(
             lb,
             null,
             STGM.DIRECT | STGM.READ | STGM.SHARE_EXCLUSIVE,
             IntPtr.Zero,
             0,
             out storage) == 0)
         {
             Storage = new StoragePart();
             ReadParts(storage, Storage);
             Marshal.ReleaseComObject(storage);
         }
     }
     else
     {
         throw (new InvalidDataException(string.Format("Part is not a compound document")));
     }
 }

 internal CompoundDocument(ILockBytes lb)
 {
     Read(lb);
 }

 internal static int IsStorageILockBytes(ILockBytes lb)
 {
     return StgIsStorageILockBytes(lb);
 }

 private static extern int StgIsStorageILockBytes(
     ILockBytes plkbyt);

 public static extern IStorage StgCreateDocfileOnILockBytes(ILockBytes plkbyt, uint grfMode, uint reserved);

 public static extern IntPtr GetHGlobalFromILockBytes(ILockBytes pLockBytes);

 static extern IStorage StgOpenStorageOnILockBytes(ILockBytes iLockBytes, IStorage pStgPriority, int grfMode, int sndExcluded, int reserved);

        public static extern int GetHGlobalFromILockBytes(ILockBytes pLkbyt,
			out IntPtr phglobal);

 public static extern int CreateILockBytesOnHGlobal(IntPtr hGlobal, [MarshalAs(UnmanagedType.Bool)] bool fDeleteOnRelease, out ILockBytes ppLkbyt);

 internal static extern void StgOpenStorageOnILockBytes(ILockBytes plkbyt, IStorage pstgPriority, Stgm grfMode,
     IntPtr snbExclude, uint reserved,
     out IStorage ppstgOpen);