At startup, test that PythonLauncher is the default application for files
of type .py, .pyw and .pyc. If not, post a warning.
diff --git a/Mac/OSX/PythonLauncher/MyAppDelegate.h b/Mac/OSX/PythonLauncher/MyAppDelegate.h
index c65175a..097b541 100644
--- a/Mac/OSX/PythonLauncher/MyAppDelegate.h
+++ b/Mac/OSX/PythonLauncher/MyAppDelegate.h
@@ -11,4 +11,5 @@
 - (IBAction)showPreferences:(id)sender;
 - (BOOL)shouldShowUI;
 - (BOOL)shouldTerminate;
+- (void)testFileTypeBinding;
 @end