diff --git a/swing/src/net/sf/openrocket/gui/components/SimulationExportPanel.java b/swing/src/net/sf/openrocket/gui/components/SimulationExportPanel.java
index cc8eed3d7..4d2c54bff 100644
--- a/swing/src/net/sf/openrocket/gui/components/SimulationExportPanel.java
+++ b/swing/src/net/sf/openrocket/gui/components/SimulationExportPanel.java
@@ -204,7 +204,7 @@ public class SimulationExportPanel extends JPanel {
 		if (file == null)
 			return;
 		
-		file = FileHelper.ensureExtension(file, "csv");
+		file = FileHelper.forceExtension(file, "csv");
 		if (!FileHelper.confirmWrite(file, this)) {
 			return;
 		}
diff --git a/swing/src/net/sf/openrocket/gui/configdialog/FreeformFinSetConfig.java b/swing/src/net/sf/openrocket/gui/configdialog/FreeformFinSetConfig.java
index 5f47b66a6..3b7da656d 100644
--- a/swing/src/net/sf/openrocket/gui/configdialog/FreeformFinSetConfig.java
+++ b/swing/src/net/sf/openrocket/gui/configdialog/FreeformFinSetConfig.java
@@ -262,7 +262,7 @@ public class FreeformFinSetConfig extends FinSetConfig {
 
                 if (JFileChooser.APPROVE_OPTION == chooser.showSaveDialog(FreeformFinSetConfig.this)){
                 	File selectedFile= chooser.getSelectedFile();
-					selectedFile = FileHelper.ensureExtension(selectedFile, "csv");
+					selectedFile = FileHelper.forceExtension(selectedFile, "csv");
 					if (!FileHelper.confirmWrite(selectedFile, panel)) {
 						return;
 					}
diff --git a/swing/src/net/sf/openrocket/gui/dialogs/PrintDialog.java b/swing/src/net/sf/openrocket/gui/dialogs/PrintDialog.java
index 4442af1cd..1e107363f 100644
--- a/swing/src/net/sf/openrocket/gui/dialogs/PrintDialog.java
+++ b/swing/src/net/sf/openrocket/gui/dialogs/PrintDialog.java
@@ -380,7 +380,7 @@ public class PrintDialog extends JDialog implements TreeSelectionListener {
 		File file = chooser.getSelectedFile();
 		if (returnVal == JFileChooser.APPROVE_OPTION && file != null) {
 			
-			file = FileHelper.ensureExtension(file, "pdf");
+			file = FileHelper.forceExtension(file, "pdf");
 			if (!FileHelper.confirmWrite(file, this)) {
 				return false;
 			}
diff --git a/swing/src/net/sf/openrocket/gui/dialogs/optimization/GeneralOptimizationDialog.java b/swing/src/net/sf/openrocket/gui/dialogs/optimization/GeneralOptimizationDialog.java
index de3a0503a..5408cc53c 100644
--- a/swing/src/net/sf/openrocket/gui/dialogs/optimization/GeneralOptimizationDialog.java
+++ b/swing/src/net/sf/openrocket/gui/dialogs/optimization/GeneralOptimizationDialog.java
@@ -1121,7 +1121,7 @@ public class GeneralOptimizationDialog extends JDialog {
 		if (file == null)
 			return;
 		
-		file = FileHelper.ensureExtension(file, "csv");
+		file = FileHelper.forceExtension(file, "csv");
 		if (!FileHelper.confirmWrite(file, this)) {
 			return;
 		}
diff --git a/swing/src/net/sf/openrocket/gui/simulation/SimulationExportPanel.java b/swing/src/net/sf/openrocket/gui/simulation/SimulationExportPanel.java
index 27b7e22d3..f6236b5aa 100644
--- a/swing/src/net/sf/openrocket/gui/simulation/SimulationExportPanel.java
+++ b/swing/src/net/sf/openrocket/gui/simulation/SimulationExportPanel.java
@@ -230,7 +230,7 @@ public class SimulationExportPanel extends JPanel {
 		if (file == null)
 			return false;
 		
-		file = FileHelper.ensureExtension(file, "csv");
+		file = FileHelper.forceExtension(file, "csv");
 		if (!FileHelper.confirmWrite(file, this)) {
 			return false;
 		}