Martin's saying that even if Blue Kenue has the co-ordinate system information and you can see it in Blue Kenue, unfortunately, there is no way to store that information inside the SLF file. Which means that the next time you load the SLF file into Blue Kenue, that information cannot be read from the SLF file so Blue Kenue cannot show that information to you.
I suppose in the future, the SLF file might be able to contain that information; something for the SLF file designers to decide... not the Blue Kenue ones
Hope that helps...
Kindly,
Alan