AirPort Utility 5.6.1 for Windows
AirPort Utility 5.6.1 allows you to configure and manage the new AirPort Express with simultaneous dual band 802.11n.
For the latest information on AirPort software, check Software Update in System Preferences or the following Apple website: Apple Support Downloads
Learn more about Apple Wi-Fi at: http://www.apple.com/wifi/
Read more http://support.apple.com/kb/DL1547