Welcome to the discussions forum jcom7.
Your Airport card firmware appears to be correct, but you should download and install the latest version of Airport Utility to configure your Extreme. According to Apple, "Earlier versions of AirPort Utility may not offer expected features or may not be able to configure your hardware properly, and should not be used." The correct version of Airport Utility will also alert you if your Extreme's firmware should be updated.
Try this link:
AirPort Utility 5.4.2 for Mac. It will work with Tiger.
Next: If you purchased a used Extreme, it is likely that it's been configured already. It would be best to reset it to an out-of-the-box condition with a "factory default reset". Read this KB article to determine the right way to do that:
Resetting an AirPort Base Station or Time Capsule FAQ.
After it's properly reset, your Airport base station will appear under your Airport icon as an open network with the name "Base Station xxxxxx" or something resembling it. *This is the best way to ensure a reset has been successful.* Select that network, then you can proceed to configure it by answering the questions in Airport Utility.
However, it is best to attach the Extreme directly to your computer via Ethernet:
This method avoids the understandable confusion that results from having to switch wireless networks for the sole purpose of configuring the Express (or Extreme), and subsequently switching networks to the new one created as a result of configuring it.
Once configured, the Extreme will restart. You can then remove your Ethernet cable and connect to it wirelessly.
I don't know what you're trying to accomplish with Airport disk utility, but you have to establish communication with the Extreme and configure it before you will be able to recognize any USB devices connected to it.