using FSX USA West Coast BGL files

[size=14] I just finished download FSX USA West Coast 10 M Terrain Mesh Series some 42 BGL files from simviation.com
Flight Simulator and other chat
https://forums.simviation.com/phpBB3/
https://forums.simviation.com/phpBB3/viewtopic.php?f=21&t=59769
I just finished download FSX USA West Coast 10 M Terrain Mesh Series some 42 BGL files from simviation.com but I just not shore what to do with them. Can I have some help/advise from the forum? I have FSX deluxe version.
Thanks and waiting for your reply.