If you are creating Windows apps, and want a complete set of libraries for accessing these functions, download the Windows SDK HERE
I always keep a copy on my dev machine. There are all kinds of things that come up with Windows programming that just require having access to Microsoft's highly monopolized interfaces to its overly burdensome OS :)
The Microsoft redistributable libraries: msvcr80.dll. msvcr100.dll et al. contain the functionality you are asking about, and as the name implies, are redistributable.