diff --git a/EExDllMain.h b/EExDllMain.h
index 93865ce..122d030 100644
--- a/EExDllMain.h
+++ b/EExDllMain.h
@@ -13,6 +13,7 @@
 
 #pragma once
 
+#include <string>
 
 class ILogger ;
 
@@ -25,6 +26,11 @@ class ILogger ;
 #endif
 
 //-----------------------------------------------------------------------------
-EEX_EXPORT const char* GetEExVersion( void) ;
-// permette di impostare il logger per la Dll
-EEX_EXPORT void SetEExLogger( ILogger* pLogger) ;
+extern "C" {
+   // restituisce la versione della Dll
+   EEX_EXPORT const char* GetEExVersion( void) ;
+   // permette di impostare il logger per la Dll
+   EEX_EXPORT void SetEExLogger( ILogger* pLogger) ;
+   // imposta la chiave di protezione
+   EEX_EXPORT void SetEExKey( const std::string& sKey) ;
+}
\ No newline at end of file
diff --git a/EExExcExecutor.h b/EExExcExecutor.h
index 6eab13e..e23ee41 100644
--- a/EExExcExecutor.h
+++ b/EExExcExecutor.h
@@ -34,4 +34,6 @@ class __declspec( novtable) IExcExecutor : public ICmdExecutor
 } ;
 
 //----------------------------------------------------------------------------
-EEX_EXPORT IExcExecutor* CreateExcExecutor( void) ;
+extern "C" {
+   EEX_EXPORT IExcExecutor* CreateExcExecutor(void) ;
+}
\ No newline at end of file
diff --git a/EExExportDxf.h b/EExExportDxf.h
index b3c225a..129cb51 100644
--- a/EExExportDxf.h
+++ b/EExExportDxf.h
@@ -35,4 +35,6 @@ class __declspec( novtable) IExportDxf
 } ;
 
 //-----------------------------------------------------------------------------
-EEX_EXPORT IExportDxf* CreateExportDxf( void) ;
+extern "C" {
+   EEX_EXPORT IExportDxf* CreateExportDxf(void) ;
+}
diff --git a/EExExportStl.h b/EExExportStl.h
index 3a3629a..2dc95a8 100644
--- a/EExExportStl.h
+++ b/EExExportStl.h
@@ -35,4 +35,6 @@ class __declspec( novtable) IExportStl
 } ;
 
 //-----------------------------------------------------------------------------
-EEX_EXPORT IExportStl* CreateExportStl( void) ;
+extern "C" {
+   EEX_EXPORT IExportStl* CreateExportStl(void) ;
+}
diff --git a/EExImportCnc.h b/EExImportCnc.h
index 7679aa5..751a713 100644
--- a/EExImportCnc.h
+++ b/EExImportCnc.h
@@ -33,4 +33,6 @@ class __declspec( novtable) IImportCnc
 } ;
 
 //-----------------------------------------------------------------------------
-EEX_EXPORT IImportCnc* CreateImportCnc( void) ;
\ No newline at end of file
+extern "C" {
+   EEX_EXPORT IImportCnc* CreateImportCnc( void) ;
+}
diff --git a/EExImportDxf.h b/EExImportDxf.h
index a8cb5b8..efb4072 100644
--- a/EExImportDxf.h
+++ b/EExImportDxf.h
@@ -35,4 +35,6 @@ class __declspec( novtable) IImportDxf
 } ;
 
 //-----------------------------------------------------------------------------
-EEX_EXPORT IImportDxf* CreateImportDxf( void) ;
\ No newline at end of file
+extern "C" {
+   EEX_EXPORT IImportDxf* CreateImportDxf(void) ;
+}
diff --git a/EExImportStl.h b/EExImportStl.h
index fb82a32..30930c7 100644
--- a/EExImportStl.h
+++ b/EExImportStl.h
@@ -33,4 +33,6 @@ class __declspec( novtable) IImportStl
 } ;
 
 //-----------------------------------------------------------------------------
-EEX_EXPORT IImportStl* CreateImportStl( void) ;
\ No newline at end of file
+extern "C" {
+   EEX_EXPORT IImportStl* CreateImportStl( void) ;
+}
diff --git a/EGrDllMain.h b/EGrDllMain.h
index 85337c8..8c233ce 100644
--- a/EGrDllMain.h
+++ b/EGrDllMain.h
@@ -25,6 +25,11 @@ class ILogger ;
 #endif
 
 //-----------------------------------------------------------------------------
-EGR_EXPORT const char* GetEGrVersion( void) ;
-// permette di impostare il logger per la Dll
-EGR_EXPORT void SetEGrLogger( ILogger* pLogger) ;
+extern "C" {
+   // restituisce la versione della Dll
+   EGR_EXPORT const char* GetEGrVersion( void) ;
+   // permette di impostare il logger per la Dll
+   EGR_EXPORT void SetEGrLogger( ILogger* pLogger) ;
+   // imposta la chiave di protezione
+   EGR_EXPORT void SetEGrKey( const std::string& sKey) ;
+}
\ No newline at end of file
diff --git a/EGrSceExecutor.h b/EGrSceExecutor.h
index f60baed..508ad4c 100644
--- a/EGrSceExecutor.h
+++ b/EGrSceExecutor.h
@@ -35,4 +35,6 @@ class __declspec( novtable) ISceExecutor : public ICmdExecutor
 } ;
 
 //----------------------------------------------------------------------------
-EGR_EXPORT ISceExecutor* CreateSceExecutor( void) ;
+extern "C" {
+   EGR_EXPORT ISceExecutor* CreateSceExecutor(void) ;
+}
diff --git a/EGrScene.h b/EGrScene.h
index 937f699..ce08959 100644
--- a/EGrScene.h
+++ b/EGrScene.h
@@ -117,8 +117,9 @@ class IEGrScene
 } ;
 
 //-----------------------------------------------------------------------------
-EGR_EXPORT IEGrScene* CreateEGrScene( void) ;
-
+extern "C" {
+   EGR_EXPORT IEGrScene* CreateEGrScene(void) ;
+}
 
 //------------------------ Costanti per tipo di driver OpenGL ----------------
 enum OglDriver { OD_SOFT = 1,
diff --git a/EMkDllMain.h b/EMkDllMain.h
index 2bc0c49..568e0d4 100644
--- a/EMkDllMain.h
+++ b/EMkDllMain.h
@@ -26,9 +26,11 @@ class ILogger ;
 #endif
 
 //-----------------------------------------------------------------------------
-// restituisce la versione della Dll (stringa del tipo 1.4a5)
-EMK_EXPORT const char* GetEMkVersion( void) ;
-// permette di impostare il logger per la Dll
-EMK_EXPORT void SetEMkLogger( ILogger* pLogger) ;
-// imposta la chiave di protezione
-EMK_EXPORT void SetEMkKey( const std::string& sKey) ;
+extern "C" {
+   // restituisce la versione della Dll
+   EMK_EXPORT const char* GetEMkVersion( void) ;
+   // permette di impostare il logger per la Dll
+   EMK_EXPORT void SetEMkLogger( ILogger* pLogger) ;
+   // imposta la chiave di protezione
+   EMK_EXPORT void SetEMkKey( const std::string& sKey) ;
+}
\ No newline at end of file
diff --git a/EMkMachMgr.h b/EMkMachMgr.h
index 0093359..533f846 100644
--- a/EMkMachMgr.h
+++ b/EMkMachMgr.h
@@ -33,4 +33,6 @@ class __declspec( novtable) IMachMgr
 } ;
 
 //-----------------------------------------------------------------------------
-EMK_EXPORT IMachMgr* CreateMachMgr( void) ;
\ No newline at end of file
+extern "C" {
+   EMK_EXPORT IMachMgr* CreateMachMgr(void) ;
+}
\ No newline at end of file
diff --git a/EgtKeyCodes.h b/EgtKeyCodes.h
new file mode 100644
index 0000000..df6ca39
--- /dev/null
+++ b/EgtKeyCodes.h
@@ -0,0 +1,29 @@
+//----------------------------------------------------------------------------
+//  EgalTech 2015-2015
+//----------------------------------------------------------------------------
+// File : EgtKeyCodes.h       Data : 27.03.15        Versione : 1.6c9
+// Contenuto : Costanti per codici di protezione librerie di base.
+//
+//
+//
+// Modifiche : 27.03.15 DS Creazione modulo.
+//
+//
+//----------------------------------------------------------------------------
+
+#pragma once
+
+//----------------------------------------------------------------------------
+const int KEY_BASELIB_PROD = 1231 ;
+const int KEY_BASELIB_VER = 16 ;
+const int KEY_BASELIB_LEV = 1 ;
+
+//----------------------------------------------------------------------------
+const int KEYOPT_EGK_BASE =    0x00001 ;     // EgtGeomKernel base
+const int KEYOPT_EGK_SAVE =    0x00002 ;     // EgtGeomKernel salvataggio
+const int KEYOPT_EGR_BASE =    0x00004 ;     // EgtGraphics
+const int KEYOPT_EEX_INPBASE = 0x00008 ;     // EgtExchange import base
+const int KEYOPT_EEX_INPADV =  0x00010 ;     // EgtExchange import avanzato
+const int KEYOPT_EEX_EXPBASE = 0x00020 ;     // EgtExchange export base
+const int KEYOPT_EEX_EXPADV =  0x00040 ;     // EgtExchange export avanzato
+const int KEYOPT_EMK_BASE =    0x00080 ;     // EgtMachKernel lavorazioni base