I have a problem

As the title says, I am trying to figure out what's wrong
I have downloaded a detailed Airport from https://gateway.x-plane.com/scenery/page/LICA
Yes the airport is LICA and I am trying to convert to a readable file for flightgear.
I researched on the internet but i only found a way to convert *.obj files to *.ac files using Blender
The problem is that what I have downloaded isn't a *.obj file, but instead I have a *.dsf file(and an apt.dat file that I am not sure what it does)
I researched again and I found out that *.dsf files are SCENERY files NOT objets.
So I have 2 alternatives:
1- Try to open that scenery file and export every objet file that is inside of it (If I can)
2- Download another file in *.obj format (I didn't find nothing

I am concentrated more on the first alternative... So any help is very appreciated
Thanks
