How would I create an NSOutlineView that handles files like XCode?

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Interesting how the subject and contents are totally different.

Here is the answer though:

In the developer folder, /Examples/AppKit/OutlineView. Just add some custom NSCell’s into the outlineview and you should be able to produce everything you need. – MatPeterson

I want to know how to I double click a row, then open in the proper NSView depending on its file type.

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You mean to display the contents of the file? If you are using an NSSplitView, you just need to switch the views. Perhaps something like this:

[splitView replaceSubview:oldView with:newView];

– RyanBates