diff --git a/TestEGrDlg.cpp b/TestEGrDlg.cpp
index f48a22d..33d03a6 100644
--- a/TestEGrDlg.cpp
+++ b/TestEGrDlg.cpp
@@ -282,21 +282,21 @@ CTestEGrDlg::OnInitDialog( void)
    if ( ! m_sFileToOpen.empty()) {
      // ricavo l'estensione
       string sDummy ;
-      string sEst ;
-      SplitLast( m_sFileToOpen, ".", sDummy, sEst) ;
-      ToUpper( sEst) ;
+      string sExt ;
+      SplitLast( m_sFileToOpen, ".", sDummy, sExt) ;
+      ToUpper( sExt) ;
      // apro il file
-      if ( sEst == "NGE"  ||  sEst == "NFE") {
+      if ( sExt == "NGE"  ||  sExt == "NFE") {
          if ( ! FileOpen( m_sFileToOpen))
             AfxMessageBox( L"Error loading file (look at Log file)", MB_ICONSTOP|MB_OK) ;
       }
      // importo DXF o STL
-      else if ( sEst == "DXF"  ||  sEst == "STL") {
+      else if ( sExt == "DXF"  ||  sExt == "STL") {
          if ( ! FileImport( m_sFileToOpen))
             AfxMessageBox( L"Error importing file (look at Log file)", MB_ICONSTOP|MB_OK) ;
       }
      // eseguo lo script
-      else if ( sEst == "TSC") {
+      else if ( sExt == "TSC") {
          if ( ! FileExec( m_sFileToOpen))
             AfxMessageBox( L"Error executing file (look at Log file)", MB_ICONSTOP|MB_OK) ;
       }