diff --git a/src/com/webcodepro/applecommander/ui/AppleCommander.java b/src/com/webcodepro/applecommander/ui/AppleCommander.java
index bbb0bb7..ecef1df 100644
--- a/src/com/webcodepro/applecommander/ui/AppleCommander.java
+++ b/src/com/webcodepro/applecommander/ui/AppleCommander.java
@@ -58,10 +58,17 @@ public class AppleCommander {
 			String[] extraArgs = new String[args.length - 1];
 			System.arraycopy(args, 1, extraArgs, 0, extraArgs.length);
 			if ("-swt".equalsIgnoreCase(args[0])) { //$NON-NLS-1$
-				launchSwtAppleCommander(args);
+				if (isSwtAvailable()) {
+					launchSwtAppleCommander(args);
+				} else {
+					System.err.println(textBundle.get("SwtVersionNotAvailable")); //$NON-NLS-1$
+				}
 			} else if ("-swing".equalsIgnoreCase(args[0])) { //$NON-NLS-1$
-                                System.err.println(textBundle.get("SwingVersionNotAvailable")); //$NON-NLS-1$
-			        launchSwingAppleCommander(args);
+				if (isSwingAvailable()) {
+					launchSwingAppleCommander(args);
+				} else {
+					System.err.println(textBundle.get("SwingVersionNotAvailable")); //$NON-NLS-1$
+				}
 			} else if ("-command".equalsIgnoreCase(args[0])) { //$NON-NLS-1$
 				System.err.println(textBundle.get("CommandLineNotAvailable")); //$NON-NLS-1$
 			} else if ("-help".equalsIgnoreCase(args[0])  //$NON-NLS-1$
diff --git a/src/com/webcodepro/applecommander/ui/UiBundle.properties b/src/com/webcodepro/applecommander/ui/UiBundle.properties
index 200dea6..5742885 100644
--- a/src/com/webcodepro/applecommander/ui/UiBundle.properties
+++ b/src/com/webcodepro/applecommander/ui/UiBundle.properties
@@ -110,6 +110,7 @@ CommandLineDC42Bad = Unable to interpret this DiskCopy 42 image.
 UserPreferencesComment = AppleCommander user preferences
 
 # AppleCommander
+SwtVersionNotAvailable = Sorry, the SWT GUI is not available.
 SwingVersionNotAvailable = Sorry, the Swing GUI is not available.
 CommandLineNotAvailable = Sorry, the command line user interface is not available.
 AppleCommanderHelp = AppleCommander general options:\n-swt will launch the SWT version of AppleCommander.\n     This requires the SWT jar and dll files to be present.\n-swing will launch the Swing version of AppleCommander.\n     (This is not implemented yet.)\n-command will enter command interpreter mode.  (This is also\n     not implemented yet.)\n-help will show this help text.