Xcode 6 and 7 errors when trying to open .sks files

Xcode both versions 6 and 7 cannot open files .sks. When I double clicked on a file, for example. GameScene.sksXcode just crashes and closes a quick, silent project. Ok, there is only one message there:

"Send crash report?"

which is not entirely informative. I do not have "old" libraries, and an accident happens for each minor and major versions from 6 to 7.

What could be the problem?

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Source: https://habr.com/ru/post/1615631/