diff --git a/API_Nesting.cpp b/API_Nesting.cpp
index e54798e..cfbbaa6 100644
--- a/API_Nesting.cpp
+++ b/API_Nesting.cpp
@@ -33,6 +33,13 @@ __stdcall EgtAdjustFlatPartLayer( int nLayerId)
    return ( ExeAdjustFlatPartLayer( nLayerId) ? TRUE : FALSE) ;
 }
 
+//-----------------------------------------------------------------------------
+BOOL
+__stdcall EgtCalcFlatPartDownRegion( int nPartId, double dH)
+{
+   return ( ExeCalcFlatPartDownRegion( nPartId, dH) ? TRUE : FALSE) ;
+}
+
 //-----------------------------------------------------------------------------
 BOOL
 __stdcall EgtPackBox( int nId, double dXmin, double dYmin,
diff --git a/EgtInterface.rc b/EgtInterface.rc
index 34c24d8..bc1d5b4 100644
Binary files a/EgtInterface.rc and b/EgtInterface.rc differ