Windows Platforms (CRT)
The C run-time libraries for Visual Studio 2012 Update 1 support Windows 8, Windows Server 2012, Windows 7, Windows Server 2008, Windows Vista, Windows XP Service Pack 3 (SP3) for x86, Windows XP Service Pack 2 (SP2) for x64, and Windows Server 2003 Service Pack 2 (SP2) for both x86 and x64. All of these operating systems support the Windows Application Programming Interface (API) and provide Unicode support. In addition, any Win32 application can use a multibyte character set (MBCS).
Visual Studio 2012 does not support Windows XP and Windows Server 2003 development. You must install Visual Studio 2012 Update 1 to add support for Windows XP and Windows Server 2003.