I would like for the Active Directory Authentication extension to pull in the user's Company from AD when the DNN user account is created. I have already created a new profile field, but now I need to tie the two together. Can anyone give me some advice on where to look to make this happen?

I tried to look for the codebehind for WindowsSignin.aspx but apparently all of that stuff is rolled into some .dll somewhere and I'm not sure how I would go about changing it even if I could find it.