Windows Runtime Unsupported CRT Functions
For the latest documentation on Visual Studio 2017 RC, see Visual Studio 2017 RC Documentation.
Many C run-time (CRT) APIs can’t be used in Windows 8.x Store apps that execute in the Windows Runtime. These apps are built by using the /ZW compiler flag. For a list of unsupported CRT functions, see CRT functions not supported by /ZW.
All CRT APIs are described in the Alphabetical Function Reference section of the documentation.