Reseting configuration

Hi. I have installed Wireshark on a Mac with OS X 10.8. At first run it asked for the X11 app... and I selected by mistake the Automator app. The problem now is that every time I run the Wireshark app it opens X11 (that it finally found without asking again) and the Automator apps (!!!)... I have uninstalled/installed Wireshark many many times with no results... How can I delete all the settings so it will ask again for X11? The X11 was renamed to XQuartz and that's why it didn't found it in the first place.