This following is a compare between the old default interface (pre 3.21.05 on the left) and the new interface (post 3.21.05 on the right) changes are in red. Use the context & line numbers to help find your way to make the changes needed to your custom interface.
It looks like a lot of code has been taken out in some of these windows. You will notice this when you see the dark RED on the left side.
I use notepad 2 its great syntax highlighting for tons of languages including xml and starts up as fast as regular notepad. http://www.flos-freeware.ch/notepad2.html
i attached a screenshot of what it looks like w/ an XML file.
Sweet thanks guys. I use Yafs UI and it is crashing EQ2 atm when I try to craft so I gota try to edit this stuff in there. Never done this before so this should be fun since I am sure your above changes depict the Standard UI and I am Sure Yafs is way different.