diff --git a/EExImportBtl.h b/EExImportBtl.h
index e1ce2c2..a454c68 100644
--- a/EExImportBtl.h
+++ b/EExImportBtl.h
@@ -36,5 +36,6 @@ class __declspec( novtable) IImportBtl
 
 //-----------------------------------------------------------------------------
 extern "C" {
+   EEX_EXPORT bool SetBtlAuxDir( const std::string& sBtlAuxDir) ;
    EEX_EXPORT IImportBtl* CreateImportBtl( void) ;
 }
diff --git a/EGkSfrCreate.h b/EGkSfrCreate.h
index 8ba60b5..862ca20 100644
--- a/EGkSfrCreate.h
+++ b/EGkSfrCreate.h
@@ -1,7 +1,7 @@
 //----------------------------------------------------------------------------
-//  EgalTech 2015-2015
+//  EgalTech 2015-2021
 //----------------------------------------------------------------------------
-// File : EGkSfrCreate.h   Data : 10.08.15       Versione : 1.6h3
+// File : EGkSfrCreate.h   Data : 25.08.21       Versione : 2.1h3
 // Contenuto : Dichiarazione funzioni per creazione superfici Sfr :
 //             Rectangle, Disk, FromCurves.
 //
diff --git a/EInAPI.h b/EInAPI.h
index 43e69bf..6434773 100644
--- a/EInAPI.h
+++ b/EInAPI.h
@@ -100,6 +100,7 @@ EIN_EXPORT BOOL __stdcall EgtSaveMachGroupToFile( int nMGroupId, const wchar_t*
 
 // Exchange
 EIN_EXPORT int  __stdcall EgtGetFileType( const wchar_t* wsFilePath) ;
+EIN_EXPORT BOOL __stdcall EgtSetBtlAuxDir( const wchar_t* wsBtlAuxDir) ;
 EIN_EXPORT BOOL __stdcall EgtImportBtl( const wchar_t* wsFilePath, int nFlag) ;
 EIN_EXPORT BOOL __stdcall EgtImportBtlx( const wchar_t* wsFilePath, int nFlag) ;
 EIN_EXPORT BOOL __stdcall EgtImportCnc( const wchar_t* wsFilePath, int nFlag) ;
diff --git a/EXeExecutor.h b/EXeExecutor.h
index 9a98ca9..693103b 100644
--- a/EXeExecutor.h
+++ b/EXeExecutor.h
@@ -107,6 +107,7 @@ EXE_EXPORT bool ExeSaveMachGroupToFile( int nMGroupId, const std::string& sFileP
 
 // Exchange
 EXE_EXPORT int  ExeGetFileType( const std::string& sFilePath) ;
+EXE_EXPORT bool ExeSetBtlAuxDir( const std::string& sBtlAuxDir) ;
 EXE_EXPORT bool ExeImportBtl( const std::string& sFilePath, int nFlag) ;
 EXE_EXPORT bool ExeImportBtlx( const std::string& sFilePath, int nFlag) ;
 EXE_EXPORT bool ExeImportCnc( const std::string& sFilePath, int nFlag) ;