iOS7-解决 "The document “XXXX.xib/storyboard" could not be opened. Could not read archive"

当我的Project用Xcode5打开过后，然后又用Xcode4.x打开，选中XXXX.xib/storyboard文件时，有时会弹出 "The
document “XXXX.xib/storyboard" could not be opened. Could not read archive" ，Xcode已给出解决方式 "Please use a newer version of Xcode. Consider changing the document's Development Target
to preserve compatibility." 所以步骤如下：
1、用 Xcode5 打开 Project ；
2、选中问题所在的 XXXX.xib/storyboard 文件，打开 "Show
File Inspector"
3、找到 "Interface Builder Document" ,编辑 "Open
in"为 Xcode4.x 保存即可。
（Xcode4.x 下没有 "Open in" ,是 "Document
Versioning" ）
4、再次用 Xcode4.x 打开，就会发现原来不能打开的 XXXX.xib/storyboard 已恢复正常。