We don't support Windows 95-ME anymore. According to http://msdn.microsoft.com/en-us/library/windows/desktop/ms724834(v=vs.85).aspx:

dwPlatformId
The operating system platform. This member can be the following value.
VER_PLATFORM_WIN32_NT:
The operating system is Windows 7, Windows Server 2008, Windows Vista, Windows Server 2003, Windows XP, or Windows 2000.

So ALL current Windows OS is NT and there is no need to keep legacy code.