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Thank you a lot, this helped me solve a mysterious crash with certain file names only happening with the app store version of my app only on iOS 12!Btw, I use Xcode 11.3.1 and the issue still seems to be present.

Same problem here: Assertion "identCStr && identCStr[0]" failed in DVTFileDataType.mm:156Interestingly the same project can be openend just fine on another Mac (same XCode, same macOS), so I assume it has something to do with the environment.EDIT: I managed to find a workaround: my *.xcodeproj contained a bunch of test files, which really were compressed files with a custom file extension (e.g. a file named "*.cb7" being a "*.7z"). After renaming these files, XCode would open again. I assume some LaunchService problems (being the one maintaining the association between extension and application, but I did not investigate further.