Detecting .Net Framework 4.5

Hi,

Is there an InstallScript constant for detecting the presence of .Net Framework 4.5?

I see that there are constants for use with Is(DOTNETFRAMEWORKINSTALLED) up to REGDB_KEYPATH_DOTNET_40_FULL but there is no REGDB_KEYPATH_DOTNET_45.

Anyone know of an alternative to get around the missing constant (providing the constant is missing)?

Thanks

Mark