【发布时间】：2016-12-27 15:53:41
【问题描述】：
我最近安装了 Visual Studio 2017 RC (15.0.26014.0) 并尝试安装扩展。但是，使用 Tools->Extensions and Updates 菜单安装任何扩展时都会失败。以下是安装日志。
27-Dec-16 10:35:19 AM - Beginning to install extension to Microsoft Visual Studio Enterprise 2017 RC...
27-Dec-16 10:35:19 AM - Install Error : System.IO.FileNotFoundException: Unable to find the specified file.
at Microsoft.VisualStudio.ExtensionManager.ExtensionEngineImpl.GetCurrentSetupInstance()
at Microsoft.VisualStudio.ExtensionManager.ExtensionEngineImpl.PerformSetupEngineInstall(InstallableExtensionImpl extension, Boolean installPerMachine, Boolean isPackComponent, IDictionary`2 extensionsInstalledSoFar, List`1 extensionsUninstalledSoFar, IInstalledExtensionList modifiedInstalledExtensionsList, IProgress`1 progress, InstallFlags installFlags, AsyncOperation asyncOp, IInstalledExtension& newExtension)
Microsoft.VisualStudio.ExtensionManager.ExtensionEngineImpl.InstallInternal (InstallableExtensionImpl extension, InstallFlags installFlags, IDictionary`2 extensionsInstalledSoFar, List`1 extensionsUninstalledSoFar,
IInstalledExtensionList modifiedInstalledExtensionsList, AsyncOperation asyncOp, IProgress`1 progress)
at Microsoft.VisualStudio.ExtensionManager.ExtensionEngineImpl.BeginInstall(IInstallableExtension installableExtension, InstallFlags installFlags, AsyncOperation asyncOp)
at Microsoft.VisualStudio.ExtensionManager.ExtensionEngineImpl.InstallWorker(IInstallableExtension extension, InstallFlags installFlags, AsyncOperation asyncOp)
我检查并发现临时文件夹中存在相应的 VSIX 文件 (C:\Users\xxxxx\AppData\Local\Temp)
【问题讨论】：
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我也有同样的错误，但是在 VS 2012 上安装扩展时会出现。