Help Viewer 2.0RC 出现"a content file required by the help viewer is missing or has been corrupted"的解决办法

在安装Visual Studio 2012 RC的更新补丁后，可能会修改注册表原有的帮助文档的路径，导致帮助文档打开时提示"a content file required by the help viewer is missing or has been corrupted."，

解决办法是打开注册表编辑器，找到HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Help\v2.0\Catalogs\VisualStudio11，将LocationPath的值改为以前帮助文档的路径即可解决。