Third party landclass and MS photoreal airports?

Hi. My question is about FSG LC, but it should apply to all third-party landclass products.By default, you'd put the .bgl for the landclass in e.g. the Addon SceneryScenery or a folder of your choice.Doing this however causes the new landclass to override the default MS photoreal airports, and instead place generic tiles there. I seem to remember that in FS9 this could be solved by putting the .bgl in an existing scenery folder (I think it was SceneryBase or SceneryWorld). I tried the Scenery folder under both those in FSX but I still got no photoreal backdrops.Is there a way to use both a third party landclass and the default MS photoreal backdrops where they exist?