diff --git a/EExImportBtl.h b/EExImportBtl.h
index 68b3625..dd13349 100644
--- a/EExImportBtl.h
+++ b/EExImportBtl.h
@@ -29,7 +29,7 @@ class __declspec( novtable) IImportBtl
 {
    public :
       virtual ~IImportBtl( void) {} 
-      virtual bool Import( const std::string& sFile, IGeomDB* pGDB) = 0 ;
+      virtual bool Import( const std::string& sFile, IGeomDB* pGDB, bool bFlatPos = false) = 0 ;
 } ;
 
 //-----------------------------------------------------------------------------
diff --git a/EInAPI.h b/EInAPI.h
index 032920a..cbba89f 100644
--- a/EInAPI.h
+++ b/EInAPI.h
@@ -84,7 +84,7 @@ EIN_EXPORT BOOL __stdcall EgtImportDxf( const wchar_t* wsFilePath, double dScale
 EIN_EXPORT BOOL __stdcall EgtImportStl( const wchar_t* wsFilePath, double dScaleFactor) ;
 EIN_EXPORT BOOL __stdcall EgtImportCnc( const wchar_t* wsFilePath) ;
 EIN_EXPORT BOOL __stdcall EgtImportCsf( const wchar_t* wsFilePath) ;
-EIN_EXPORT BOOL __stdcall EgtImportBtl( const wchar_t* wsFilePath) ;
+EIN_EXPORT BOOL __stdcall EgtImportBtl( const wchar_t* wsFilePath, BOOL bFlatPos) ;
 EIN_EXPORT BOOL __stdcall EgtExportDxf( int nId, const wchar_t* wsFilePath) ;
 EIN_EXPORT BOOL __stdcall EgtExportStl( int nId, const wchar_t* wsFilePath) ;
 
diff --git a/EXeExecutor.h b/EXeExecutor.h
index 2ea7e71..aaa341f 100644
--- a/EXeExecutor.h
+++ b/EXeExecutor.h
@@ -85,7 +85,7 @@ EXE_EXPORT bool ExeImportDxf( const std::string& sFilePath, double dScaleFactor)
 EXE_EXPORT bool ExeImportStl( const std::string& sFilePath, double dScaleFactor) ;
 EXE_EXPORT bool ExeImportCnc( const std::string& sFilePath) ;
 EXE_EXPORT bool ExeImportCsf( const std::string& sFilePath) ;
-EXE_EXPORT bool ExeImportBtl( const std::string& sFilePath) ;
+EXE_EXPORT bool ExeImportBtl( const std::string& sFilePath, bool bFlatPos) ;
 EXE_EXPORT bool ExeExportDxf( int nId, const std::string& sFilePath) ;
 EXE_EXPORT bool ExeExportStl( int nId, const std::string& sFilePath) ;