diff --git a/Mac/PythonLauncher/MyAppDelegate.h b/Mac/PythonLauncher/MyAppDelegate.h
--- a/Mac/PythonLauncher/MyAppDelegate.h
+++ b/Mac/PythonLauncher/MyAppDelegate.h
@@ -11,5 +11,4 @@
 - (IBAction)showPreferences:(id)sender;
 - (BOOL)shouldShowUI;
 - (BOOL)shouldTerminate;
-- (void)testFileTypeBinding;
 @end
diff --git a/Mac/PythonLauncher/MyAppDelegate.m b/Mac/PythonLauncher/MyAppDelegate.m
--- a/Mac/PythonLauncher/MyAppDelegate.m
+++ b/Mac/PythonLauncher/MyAppDelegate.m
@@ -20,8 +20,6 @@
 
 - (void)applicationDidFinishLaunching:(NSNotification *)notification
 {
-    // Test that the file mappings are correct
-    [self testFileTypeBinding];
     // If we were opened because of a file drag or doubleclick
     // we've set initial_action_done in shouldShowUI
     // Otherwise we open a preferences dialog.
@@ -53,44 +51,4 @@
     return NO;
 }
 
-- (void)testFileTypeBinding
-{
-    NSURL *ourUrl;
-    OSStatus err;
-    FSRef appRef;
-    NSURL *appUrl;
-    static NSString *extensions[] = { @"py", @"pyw", @"pyc", NULL};
-    NSString **ext_p;
-    int i;
-
-    if ([[NSUserDefaults standardUserDefaults] boolForKey: @"SkipFileBindingTest"])
-        return;
-    ourUrl = [NSURL fileURLWithPath: [[NSBundle mainBundle] bundlePath]];
-    for( ext_p = extensions; *ext_p; ext_p++ ) {
-        err = LSGetApplicationForInfo(
-            kLSUnknownType,
-            kLSUnknownCreator,
-            (CFStringRef)*ext_p,
-            kLSRolesViewer,
-            &appRef,
-            (CFURLRef *)&appUrl);
-        if (err || ![appUrl isEqual: ourUrl] ) {
-            i = NSRunAlertPanel(@"File type binding",
-                @"PythonLauncher is not the default application for all " \
-                  @"Python script types. You should fix this with the " \
-                  @"Finder's \"Get Info\" command.\n\n" \
-                  @"See \"Changing the application that opens a file\" in " \
-                  @"Mac Help for details.",
-                @"OK",
-                @"Don't show this warning again",
-                NULL);
-            if ( i == 0 ) { // Don't show again
-                [[NSUserDefaults standardUserDefaults]
-                    setObject:@"YES" forKey:@"SkipFileBindingTest"];
-            }
-            return;
-        }
-    }
-}
-
 @end