The App store release of Xcode 8.0 (8A218a) crashes when trying to open or view old xib files (initially created for iOS 3 or 5). Xcode 8 not only crashes; but any attempt to relaunch Xcode 8 results in an immediate crash on launch before the project or xib can be closed or deselected. I had to move the xib file out of the project directory just to launch Xcode ever again. Xcode can build the app with the UIViewController that uses the old xib. It just can't view the xib (by clicking on the file name in the navigator).
Not sure how to fix or update the old xib file. Any ideas?