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The latest version of this topic can be found at Windows Runtime Unsupported CRT Functions.
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.
See Also
Run-Time Routines by Category
Alphabetical Function Reference