Military AI Works

I have UKMIL scenery for Leuchars and I have a question about the installation. I did the manual install and there is a file that I am not sure where it goes. The file is UKSD_LL.BGL. Does anyone know where this file goes?

I have it in my Addon Scenery\scenery folder and the scenery is in Addon Scenery\UKMIL.org.uk\RAF Leuchars FS9.
Better to ask on their forum....

Giorgio