diff --git a/API_GdbModifyCurve.cpp b/API_GdbModifyCurve.cpp
index 33a9cc0..2bafc3d 100644
--- a/API_GdbModifyCurve.cpp
+++ b/API_GdbModifyCurve.cpp
@@ -209,6 +209,20 @@ __stdcall EgtModifyArc3P( int nId, const double ptMid[3], int nRefType)
    return ( ExeModifyArc3P( nId, ptMid, nRefType) ? TRUE : FALSE) ;
 }
 
+//-------------------------------------------------------------------------------
+BOOL
+__stdcall EgtModifyArcByFlip( int nId)
+{
+   return ( ExeModifyArcByFlip( nId) ? TRUE : FALSE) ;
+}
+
+//-------------------------------------------------------------------------------
+BOOL
+__stdcall EgtModifyArcToExplementary( int nId)
+{
+   return ( ExeModifyArcToExplementary( nId) ? TRUE : FALSE) ;
+}
+
 //-------------------------------------------------------------------------------
 BOOL
 __stdcall EgtCloseCurveCompo( int nId)
diff --git a/EgtInterface.rc b/EgtInterface.rc
index 8581d30..67227d6 100644
Binary files a/EgtInterface.rc and b/EgtInterface.rc differ