It is now believed, contrary to previous rumour, that Interface Builder (from Xcode 3 dev tools) can be made to run in OS X 10.7 Lion. Carbon nibs and xibs will be editable if IB is set to open in 32-bit mode. I did some groundwork for a xib editor written in FB, but don't plan further development. Of course, if the previous rumour turns out to be right, a xib editor will suddenly seem urgent. 4toc.com/fb/XibEdit.zip [20 KB] The demo shows how to parse XML and (at a higher level) how to read and modify IBHIWindowTemplate objects. Robert P.