diff --git a/dlls/acledit/main.c b/dlls/acledit/main.c
index ec6166b1882..d1a9ac71ab7 100644
--- a/dlls/acledit/main.c
+++ b/dlls/acledit/main.c
@@ -23,6 +23,7 @@
 #include "windef.h"
 #include "winbase.h"
 #include "winuser.h"
+#include "wfext.h"
 
 #include "wine/unicode.h"
 #include "wine/debug.h"
diff --git a/include/Makefile.in b/include/Makefile.in
index d2ceb153961..3b08d73e6e8 100644
--- a/include/Makefile.in
+++ b/include/Makefile.in
@@ -369,6 +369,7 @@ SRCDIR_INCLUDES = \
 	ver.h \
 	vfw.h \
 	vfwmsgs.h \
+	wfext.h \
 	winbase.h \
 	wincon.h \
 	wincred.h \
diff --git a/include/wfext.h b/include/wfext.h
new file mode 100644
index 00000000000..366e49f759a
--- /dev/null
+++ b/include/wfext.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2007 Francois Gouget
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+#ifndef __WINE_WFEXT_H
+#define __WINE_WFEXT_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+LONG WINAPI FMExtensionProc(HWND,WORD,LONG);
+LONG WINAPI FMExtensionProcW(HWND,WORD,LONG);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif