It’s in the “stable” part that we’ve made major changes in this latest CTP6. The VCRuntime still exists in the same form and with equivalent contents as in previous CTPs. At the time, this “stable” part took the form of two libraries: the AppCRT and the DesktopCRT (the release DLLs were named appcrt140.dll and desktopcrt140.dll). In our articles last June, we explained how we had split the CRT into two logical parts: The VCRuntime, which contained the compiler support functionality required for things like process startup and exception handling, and a “stable” part that contained all of the purely library parts of the CRT, which we would service in-place in the future rather than releasing newly versioned DLLs with each major version of Visual Studio. We’ll be discussing these changes in a pair of articles again: this article discusses the major architectural changes since the first CTP a subsequent article will enumerate all of the new features, bug fixes, and breaking changes in greater detail. The recently-released Visual Studio 2015 CTP6 has all of these improvements that we’ve been working on. While we haven’t made many changes to the CRT since that first CTP, we have indeed been hard at work on addressing your feedback, working on further improvements, and finishing up some longer-running projects. We are especially appreciative about the many excellent bugs that you’ve reported on Microsoft Connect. We’ve received a lot of feedback from you, our customers, over the months since we wrote those articles and released the first Community Technology Preview (CTP) of Visual Studio 2015. In “C Runtime (CRT) Features, Fixes, and Breaking Changes in Visual Studio 14 CTP1” we enumerated all of the notable features we’d implemented and behavioral changes that we’d made. In “The Great C Runtime (CRT) Refactoring” we explained the major architectural changes that we had made to the CRT.

In June of last year we published a pair of articles discussing the major changes that we had made to the Visual C++ C Runtime (CRT) for Visual Studio 2015.

Visual studio 2015 runtime