Applications must not perform version checks for equality (= 5.1). If you need a specific feature, check whether the feature ...

Applications must not perform version checks for equality (== 5.1). If you need a specific feature, check whether the feature is available. If you need Windows XP, check for Windows XP or later (>= 5.1), This way, your detection code will continue to work on future versions of Windows. Driver installers and uninstall modules should never check the OS version.