Changing WEP Authentication Type - Internet Sharing

OK, this is a question for those who are techi and are up to the challenge.
I am currently using my Mac (OS X 10.4.10) to share it's AirPort Extreme WiFi connection and using a WEP key. However I have done my research and found that the Airport Extreme cards use the Shared System method of authenticating the WEP key. However, with that setting, when a Windows XP machine attempts to connect, it is unable to do so unless it is setup to authenticate using a shared key.
Now comes the challenge:
Is there anyway to change the Internet Sharing to disperse the WEP key in Open System mode?
I have been looking through all the various Terminal commands and have had no luck finding something useful. Then today I looked through all the .plist files to find if there was something there to change the setting...I found a few regarding the AirPort but they were all for the client side...not the apache serve side (ie the internet sharing).
Anyhow I am not by any means a fluent Unix/Mac user but I am a quick learner and I know quite a bit about computers, so feel free to delve deep into the interworkings of how to do this...I will do my best to follow.
Thank you!

I am not using the Airport Admin Utility because this is not the Airport device. This is the onboard Airport Extreme in my eMac. As far as for authenticating with WEP...I would love to do it this way since I am trying to integrate it into an existing wireless network I already have.
Great ideas, though...I am still looking for an answer...there has got to be a way. It is Unix after all

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    Message was edited by: pogster

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