diff --git a/reactos/include/objbase.h b/reactos/include/objbase.h
new file mode 100644
index 00000000000..76ee174e912
--- /dev/null
+++ b/reactos/include/objbase.h
@@ -0,0 +1,25 @@
+/* $Id $
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#if (__W32API_MAJOR_VERSION < 2 || __W32API_MINOR_VERSION < 5)
+#ifdef DBG
+#undef DBG
+#define DBG 1
+#endif /* defined(DBG) */
+#endif /* __W32API_MAJOR_VERSION < 2 || __W32API_MINOR_VERSION < 5 */
+
+#include_next <objbase.h>
diff --git a/reactos/include/wine/commctrl.h b/reactos/include/wine/commctrl.h
index 44215b982cc..4182c5d70ee 100644
--- a/reactos/include/wine/commctrl.h
+++ b/reactos/include/wine/commctrl.h
@@ -1,3 +1,12 @@
+/* $Id $
+ *
+ * Compatibility header
+ *
+ * This header is wrapper to allow compilation of Wine DLLs under ReactOS
+ * build system. It contains definitions commonly refered to as Wineisms
+ * and definitions that are missing in w32api.
+ */
+
 #include_next <commctrl.h>
 
 #ifndef __WINE_COMMCTRL_H
@@ -51,4 +60,58 @@ typedef LPFINDINFOW LPLVFINDINFOW;
 
 #define FLATSB_CLASSA         "flatsb_class32"
 
+#if (__W32API_MAJOR_VERSION < 2 || __W32API_MINOR_VERSION < 5)
+
+#if (_WIN32_IE >= 0x0500)
+#if (_WIN32_WINNT >= 0x0501)
+#define COMCTL32_VERSION 6
+#else
+#define COMCTL32_VERSION 5
+#endif
+#endif
+
+#define DPAS_SORTED	1
+#define DPAS_INSERTBEFORE	2
+#define DPAS_INSERTAFTER	4
+
+#if (_WIN32_IE >= 0x0400)
+#define TCIS_HIGHLIGHTED 2
+#endif
+
+typedef struct _DSA *HDSA;
+typedef struct _DPA *HDPA;
+typedef INT (CALLBACK *PFNDPAENUMCALLBACK)(PVOID,PVOID);
+typedef INT (CALLBACK *PFNDSAENUMCALLBACK)(PVOID,PVOID);
+typedef INT (CALLBACK *PFNDPACOMPARE)(PVOID,PVOID,LPARAM);
+#if (_WIN32_WINNT >= 0x0501)
+typedef LRESULT (CALLBACK *SUBCLASSPROC)(HWND,UINT,WPARAM,LPARAM,UINT_PTR,DWORD_PTR);
+#endif /* _WIN32_WINNT >= 0x0501 */
+
+HDSA WINAPI DSA_Create(INT,INT);
+BOOL WINAPI DSA_Destroy(HDSA);
+VOID WINAPI DSA_DestroyCallback(HDSA,PFNDSAENUMCALLBACK,PVOID);
+PVOID WINAPI DSA_GetItemPtr(HDSA,INT);
+INT WINAPI DSA_InsertItem(HDSA,INT,PVOID);
+
+HDPA WINAPI DPA_Create(INT);
+BOOL WINAPI DPA_Destroy(HDPA);
+PVOID WINAPI DPA_DeletePtr(HDPA,INT);
+BOOL WINAPI DPA_DeleteAllPtrs(HDPA);
+VOID WINAPI DPA_EnumCallback(HDPA,PFNDPAENUMCALLBACK,PVOID);
+VOID WINAPI DPA_DestroyCallback(HDPA,PFNDPAENUMCALLBACK,PVOID);
+BOOL WINAPI DPA_SetPtr(HDPA,INT,PVOID);
+INT WINAPI DPA_InsertPtr(HDPA,INT,PVOID);
+PVOID WINAPI DPA_GetPtr(HDPA,INT_PTR);
+BOOL WINAPI DPA_Sort(HDPA,PFNDPACOMPARE,LPARAM);
+INT WINAPI DPA_Search(HDPA,PVOID,INT,PFNDPACOMPARE,LPARAM,UINT);
+BOOL WINAPI Str_SetPtrW(LPWSTR*,LPCWSTR);
+
+#if (_WIN32_WINNT >= 0x0501)
+BOOL WINAPI SetWindowSubclass(HWND,SUBCLASSPROC,UINT_PTR,DWORD_PTR);
+BOOL WINAPI RemoveWindowSubclass(HWND,SUBCLASSPROC,UINT_PTR);
+LRESULT WINAPI DefSubclassProc(HWND,UINT,WPARAM,LPARAM);
+#endif /* _WIN32_WINNT >= 0x0501 */
+
+#endif /* __W32API_MAJOR_VERSION < 2 || __W32API_MINOR_VERSION < 5 */
+
 #endif /* __WINE_COMMCTRL_H */
diff --git a/reactos/include/wine/objbase.h b/reactos/include/wine/objbase.h
index d46d9751e51..1c32e60ca51 100644
--- a/reactos/include/wine/objbase.h
+++ b/reactos/include/wine/objbase.h
@@ -19,6 +19,11 @@
 #define WINOLEAPI STDAPI
 #define WINOLEAPI_(type) STDAPI_(type)
 
+#ifdef DBG
+#undef DBG
+#define DBG 1
+#endif
+
 #include_next <objbase.h>
 
 #ifndef _OBJBASE_H_
diff --git a/reactos/include/wine/olectl.h b/reactos/include/wine/olectl.h
new file mode 100644
index 00000000000..0eeee70ec56
--- /dev/null
+++ b/reactos/include/wine/olectl.h
@@ -0,0 +1,24 @@
+/* $Id $
+ *
+ * Compatibility header
+ *
+ * This header is wrapper to allow compilation of Wine DLLs under ReactOS
+ * build system. It contains definitions commonly refered to as Wineisms
+ * and definitions that are missing in w32api.
+ */
+
+#include_next <olectl.h>
+
+#ifndef __WINE_OLECTL_H
+#define __WINE_OLECTL_H
+
+#include <w32api.h>
+
+#if (__W32API_MAJOR_VERSION < 2 || __W32API_MINOR_VERSION < 5)
+
+#include <ocidl.h>
+
+#endif /* __W32API_MAJOR_VERSION < 2 || __W32API_MINOR_VERSION < 5 */
+
+
+#endif /* __WINE_GDI_H */
diff --git a/reactos/include/wine/winbase.h b/reactos/include/wine/winbase.h
new file mode 100644
index 00000000000..656ac521e05
--- /dev/null
+++ b/reactos/include/wine/winbase.h
@@ -0,0 +1,25 @@
+/* $Id $
+ *
+ * Compatibility header
+ *
+ * This header is wrapper to allow compilation of Wine DLLs under ReactOS
+ * build system. It contains definitions commonly refered to as Wineisms
+ * and definitions that are missing in w32api.
+ */
+
+#include_next <winbase.h>
+
+#ifndef __WINE_WINBASE_H
+#define __WINE_WINBASE_H
+
+#include <w32api.h>
+
+#if (__W32API_MAJOR_VERSION < 2 || __W32API_MINOR_VERSION < 5)
+
+#if (_WIN32_WINNT >= 0x0500)
+UINT WINAPI GetSystemWindowsDirectoryW(LPWSTR,UINT);
+#endif
+
+#endif /* __W32API_MAJOR_VERSION < 2 || __W32API_MINOR_VERSION < 5 */
+
+#endif /* __WINE_WINSPOOL_H */
diff --git a/reactos/include/wine/winnt.h b/reactos/include/wine/winnt.h
index 3ea44a0817b..c6623cdc730 100644
--- a/reactos/include/wine/winnt.h
+++ b/reactos/include/wine/winnt.h
@@ -57,6 +57,14 @@ static inline struct _TEB * NtCurrentTeb(void)
  return pTeb;
 }
 
+#if (_WIN32_WINNT >= 0x0500)
+typedef LONG (WINAPI *PVECTORED_EXCEPTION_HANDLER)(PEXCEPTION_POINTERS);
 #endif
 
+/* Fix buggy definition in w32api 2.4 */
+#undef INVALID_FILE_ATTRIBUTES
+#define INVALID_FILE_ATTRIBUTES ((DWORD) (-1))
+
+#endif /* __W32API_MAJOR_VERSION < 2 || __W32API_MINOR_VERSION < 5 */
+
 #endif  /* __WINE_WINNT_H */
diff --git a/reactos/include/wine/winspool.h b/reactos/include/wine/winspool.h
new file mode 100644
index 00000000000..2e1d09ecfa5
--- /dev/null
+++ b/reactos/include/wine/winspool.h
@@ -0,0 +1,26 @@
+/* $Id $
+ *
+ * Compatibility header
+ *
+ * This header is wrapper to allow compilation of Wine DLLs under ReactOS
+ * build system. It contains definitions commonly refered to as Wineisms
+ * and definitions that are missing in w32api.
+ */
+
+#include_next <winspool.h>
+
+#ifndef WINE_WINSPOOL_H
+#define WINE_WINSPOOL_H
+
+#include <w32api.h>
+
+#if (__W32API_MAJOR_VERSION < 2 || __W32API_MINOR_VERSION < 5)
+
+#if _WIN32_WINNT >= 0x0500
+BOOL WINAPI GetDefaultPrinterA(LPSTR,LPDWORD);
+BOOL WINAPI GetDefaultPrinterW(LPWSTR,LPDWORD);
+#endif
+
+#endif /* __W32API_MAJOR_VERSION < 2 || __W32API_MINOR_VERSION < 5 */
+
+#endif /* WINE_WINSPOOL_H */
diff --git a/reactos/include/wine/winternl.h b/reactos/include/wine/winternl.h
index 41046674492..6b8e07a3974 100644
--- a/reactos/include/wine/winternl.h
+++ b/reactos/include/wine/winternl.h
@@ -22,6 +22,7 @@
 #define __WINE_WINTERNAL_H
 
 #include <windef.h>
+#include <wine/winnt.h>
 
 #ifdef __cplusplus
 extern "C" {
diff --git a/reactos/include/winuser.h b/reactos/include/winuser.h
new file mode 100644
index 00000000000..856bbdaeb4f
--- /dev/null
+++ b/reactos/include/winuser.h
@@ -0,0 +1,23 @@
+/* $Id $
+ *
+ * Compatibility header
+ */
+
+#ifndef REACTOS_WINUSER_H
+#define REACTOS_WINUSER_H
+
+#include <w32api.h>
+
+#if (__W32API_MAJOR_VERSION < 2 || __W32API_MINOR_VERSION < 5)
+
+#ifdef WINVER
+#undef WINVER
+#endif
+
+#define WINVER 0x0501
+
+#endif /* __W32API_MAJOR_VERSION < 2 || __W32API_MINOR_VERSION < 5 */
+
+#include_next <winuser.h>
+
+#endif /* REACTOS_WINUSER_H */
diff --git a/reactos/lib/ws2_32/misc/dllmain.c b/reactos/lib/ws2_32/misc/dllmain.c
index 25eba0f87ac..94bd5f6b941 100644
--- a/reactos/lib/ws2_32/misc/dllmain.c
+++ b/reactos/lib/ws2_32/misc/dllmain.c
@@ -7,6 +7,7 @@
  * REVISIONS:
  *   CSH 01/09-2000 Created
  */
+#include <w32api.h>
 #include <ws2_32.h>
 #include <catalog.h>
 #include <handle.h>
@@ -394,8 +395,13 @@ bind(
     return SOCKET_ERROR;
   }
 
+#if (__W32API_MAJOR_VERSION < 2 || __W32API_MINOR_VERSION < 5)
+  Status = Provider->ProcTable.lpWSPBind(
+    s, (CONST LPSOCKADDR) name, namelen, &Errno);
+#else
   Status = Provider->ProcTable.lpWSPBind(
     s, name, namelen, &Errno);
+#endif /* __W32API_MAJOR_VERSION < 2 || __W32API_MINOR_VERSION < 5 */
 
   DereferenceProviderByPointer(Provider);
 
@@ -538,8 +544,13 @@ WSAConnect(
     return SOCKET_ERROR;
   }
 
+#if (__W32API_MAJOR_VERSION < 2 || __W32API_MINOR_VERSION < 5)
+  Status = Provider->ProcTable.lpWSPConnect(
+    s, (CONST LPSOCKADDR) name, namelen, lpCallerData, lpCalleeData, lpSQOS, lpGQOS, &Errno);
+#else
   Status = Provider->ProcTable.lpWSPConnect(
     s, name, namelen, lpCallerData, lpCalleeData, lpSQOS, lpGQOS, &Errno);
+#endif
 
   DereferenceProviderByPointer(Provider);
 
diff --git a/reactos/lib/ws2_32/misc/sndrcv.c b/reactos/lib/ws2_32/misc/sndrcv.c
index b92562c000d..0c31b80cb52 100644
--- a/reactos/lib/ws2_32/misc/sndrcv.c
+++ b/reactos/lib/ws2_32/misc/sndrcv.c
@@ -7,6 +7,8 @@
  * REVISIONS:
  *   CSH 01/09-2000 Created
  */
+
+#include <w32api.h>
 #include <ws2_32.h>
 #include <catalog.h>
 #include <handle.h>
@@ -297,9 +299,15 @@ WSASendTo(
 
   assert(Provider->ProcTable.lpWSPSendTo);
 
+#if (__W32API_MAJOR_VERSION < 2 || __W32API_MINOR_VERSION < 5)
+  Code = Provider->ProcTable.lpWSPSendTo(s, lpBuffers, dwBufferCount,
+    lpNumberOfBytesSent, dwFlags, (CONST LPSOCKADDR) lpTo, iToLen, lpOverlapped,
+    lpCompletionRoutine, NULL /* lpThreadId */, &Errno);
+#else
   Code = Provider->ProcTable.lpWSPSendTo(s, lpBuffers, dwBufferCount,
     lpNumberOfBytesSent, dwFlags, lpTo, iToLen, lpOverlapped,
     lpCompletionRoutine, NULL /* lpThreadId */, &Errno);
+#endif /* __W32API_MAJOR_VERSION < 2 || __W32API_MINOR_VERSION < 5 */
 
   DereferenceProviderByPointer(Provider);