visual c++ 2013 runtime for sideloaded windows 8.1 apps
Windows Runtime Windows Phone 8.1 uses a version of the Windows Runtime named the Windows Phone Runtime. It enables developing applications in C# and VB.NET, and Windows Runtime components in C++/CX.[3]
Windows 7 Platform Update for Windows 7 SP1 and Windows Server 2008 R2 SP1 was released on February 26, 2013[127] after a pre-release version had been released on November 5, 2012.[128] It is also included with Internet Explorer 10 for Windows 7.[129]