diff --git a/EExExport3dm.h b/EExExport3dm.h
new file mode 100644
index 0000000..3164f4a
--- /dev/null
+++ b/EExExport3dm.h
@@ -0,0 +1,40 @@
+//----------------------------------------------------------------------------
+//  EgalTech 2023
+//----------------------------------------------------------------------------
+// File : EExExport3dm.h          Data : 21.09.23          Versione :
+// Contenuto : Dichiarazione della interfaccia IExport3dm.
+//
+//
+//
+// Modifiche : 21.09.23 DB Creazione modulo.
+//
+//
+//----------------------------------------------------------------------------
+
+#pragma once
+
+#include "/EgtDev/Include/EGkGeomDB.h"
+#include "/EgtDev/Include/EExExportConst.h"
+#include <string>
+
+//----------------------- Macro per import/export ----------------------------
+#undef EEK_EXPORT
+#if defined( I_AM_EEX)            // da definirsi solo nella DLL
+#define EEX_EXPORT __declspec( dllexport)
+#else
+#define EEX_EXPORT __declspec( dllimport)
+#endif
+
+//-----------------------------------------------------------------------------
+class __declspec( novtable) IExport3dm
+{
+public :
+   virtual ~IExport3dm( void) {}
+   virtual bool SetOptions( int nFilter) = 0 ;
+   virtual bool Export( IGeomDB* pGDB, int nId, const std::string& sFile) = 0 ;
+} ;
+
+//-----------------------------------------------------------------------------
+extern "C" {
+   EEX_EXPORT IExport3dm* CreateExport3dm(void) ;
+}
diff --git a/EXeConst.h b/EXeConst.h
index 446021e..46695c7 100644
--- a/EXeConst.h
+++ b/EXeConst.h
@@ -29,6 +29,7 @@ enum FileType { FT_NULL =  0,
                 FT_BTLX = 19,
                 FT_3MF =  20,
                 FT_OBJ = 21,
+                FT_3DM = 22 ,
                 FT_IGES = 31,
                 FT_STEP = 32,
                 FT_ACIS = 33,
diff --git a/EXeExecutor.h b/EXeExecutor.h
index 786cec5..5cae25f 100644
--- a/EXeExecutor.h
+++ b/EXeExecutor.h
@@ -126,6 +126,7 @@ EXE_EXPORT bool ExeAdvancedImport( const std::string& sFilePath, double dToler =
 EXE_EXPORT bool ExeExportDxf( int nId, const std::string& sFilePath, int nFlag = 1, int nFilter = 393) ;
 EXE_EXPORT bool ExeExportStl( int nId, const std::string& sFilePath, int nFilter = 393) ;
 EXE_EXPORT bool ExeExport3MF( int nId, const std::string& sFilePath, int nFilter = 393) ;
+EXE_EXPORT bool ExeExport3dm( int nId, const std::string& sFilePath, int nFilter = 393) ;
 EXE_EXPORT bool ExeExportSvg( int nId, const std::string& sFilePath, int nFilter = 393) ;
 EXE_EXPORT bool ExeSetThreeJSLibDir( const std::string & sThreeJSLibDir) ;
 EXE_EXPORT bool ExeExportThreeJS( int nId, const std::string& sFilePath, int nFilter = 393) ;