diff --git a/EGkGeomDB.h b/EGkGeomDB.h
index 6d7a335..162e7be 100644
--- a/EGkGeomDB.h
+++ b/EGkGeomDB.h
@@ -43,6 +43,7 @@ class __declspec( novtable) IGeomDB
       virtual bool Clear( void) = 0 ;
       virtual bool Load( const std::string& sFileIn, int nGroupId = GDB_ID_ROOT) = 0 ;
       virtual bool Save( int nId, const std::string& sFileOut, int nFlag = GDB_SV_BIN) const = 0 ;
+      virtual bool Save( const INTVECTOR& vId, const std::string& sFileOut, int nFlag = GDB_SV_BIN) const = 0 ;
       virtual bool ExistsObj( int nId) const = 0 ;
       virtual int  AddGroup( int nId, int nParentId, const Frame3d& frFrame) = 0 ;
       virtual int  InsertGroup( int nId, int nRefId, int nSonBeforeAfter, const Frame3d& frFrame) = 0 ;
diff --git a/EGnFileUtils.h b/EGnFileUtils.h
index 244bec3..cc6c9ee 100644
--- a/EGnFileUtils.h
+++ b/EGnFileUtils.h
@@ -1,7 +1,7 @@
 //----------------------------------------------------------------------------
 //  EgalTech 2013-2020
 //----------------------------------------------------------------------------
-// File : EgnFileUtils.h       Data : 14.02.20          Versione : 2.2b1
+// File : EgnFileUtils.h       Data : 30.11.20          Versione : 2.2k
 // Contenuto : Prototipi funzioni di utilità su file e direttori.
 //
 //
@@ -30,6 +30,7 @@ EGN_EXPORT bool CopyFileEgt( const std::string& sFile, const std::string& sNewFi
 EGN_EXPORT bool RenameFile( const std::string& sFile, const std::string& sNewFile) ;
 EGN_EXPORT bool EraseFile( const std::string& sFile) ;
 EGN_EXPORT bool CompareFilesLastWriteTime( const std::string& sFile1, const std::string& sFile2, int& nRes) ;
+EGN_EXPORT std::string GetFileExtension( const std::string& sFile) ;
 EGN_EXPORT std::string ChangeFileExtension( const std::string& sFile, const std::string& sNewExt) ;
 EGN_EXPORT bool FileExtensionMatches( const std::string& sFile, const std::string& sExt) ;
 EGN_EXPORT bool FindFirstFileEgt( const std::string& sFileSpec, std::string& sFileName) ;
diff --git a/EInAPI.h b/EInAPI.h
index f8ab952..64539e5 100644
--- a/EInAPI.h
+++ b/EInAPI.h
@@ -96,6 +96,7 @@ EIN_EXPORT BOOL __stdcall EgtOpenFile( const wchar_t* wsFilePath) ;
 EIN_EXPORT BOOL __stdcall EgtInsertFile( const wchar_t* wsFilePath) ;
 EIN_EXPORT BOOL __stdcall EgtSaveFile( const wchar_t* wsFilePath, int nFlag) ;
 EIN_EXPORT BOOL __stdcall EgtSaveObjToFile( int nId, const wchar_t* wsFilePath, int nFlag) ;
+EIN_EXPORT BOOL __stdcall EgtSaveMachGroupToFile( int nMGroupId, const wchar_t* wsFilePath, int nFlag) ;
 
 // Exchange
 EIN_EXPORT int  __stdcall EgtGetFileType( const wchar_t* wsFilePath) ;
diff --git a/EMkMachMgr.h b/EMkMachMgr.h
index b8a73ae..d81d825 100644
--- a/EMkMachMgr.h
+++ b/EMkMachMgr.h
@@ -46,6 +46,7 @@ class __declspec( novtable) IMachMgr
       virtual bool GetCurrMachineName( std::string& sMachineName) const = 0 ;
       virtual bool GetCurrMachineDir( std::string& sMachineDir) const = 0 ;
      // MachGroups
+      virtual bool IsMachBase( int nId) const = 0 ;
       virtual int  GetMachGroupCount( void) const = 0 ;
       virtual int  GetFirstMachGroup( void) const = 0 ;
       virtual int  GetNextMachGroup( int nId) const = 0 ;
diff --git a/EXeExecutor.h b/EXeExecutor.h
index f001604..d64f689 100644
--- a/EXeExecutor.h
+++ b/EXeExecutor.h
@@ -102,6 +102,7 @@ EXE_EXPORT bool ExeOpenFile( const std::string& sFilePath) ;
 EXE_EXPORT bool ExeInsertFile( const std::string& sFilePath) ;
 EXE_EXPORT bool ExeSaveFile( const std::string& sFilePath, int nFlag) ;
 EXE_EXPORT bool ExeSaveObjToFile( int nId, const std::string& sFilePath, int nFlag) ;
+EXE_EXPORT bool ExeSaveMachGroupToFile( int nMGroupId, const std::string& sFilePath, int nFlag) ;
 
 // Exchange
 EXE_EXPORT int  ExeGetFileType( const std::string& sFilePath) ;