As you know, Microsoft segregated obx and apx
Actually Microsoft doesn't segregate OB and AP "data" into different types of files. AP files include airport data which includes many scenery objects. OB files do include objects, but you can run a simple quick test - move / rename the OB file for a complex, but not custom, stock airport - see how much of the scenery objects are part of the AP file.
BTW - the X is the version # of FS, not part of type of file.
There are many scenery library objects in AP files - including many localizer antennas, many VOR antennas, many NDB transmitters, glidepath transmitters, windsocks, fuel station objects, and many, many more.
The AP file is limited as far as I can tell to airport objects - and Microsoft deals with two separate sections of the airport in the default files.
The first which we are most familiar with is the data included under the airport header. Lee Swordy only worked with those elements in his program.
The second is actually above the airport headers at the top of the AP file - and includes most of the library objects for airports in that file.
Before we were always working with just a part of the airport. This version of ADE gives us a properly structured file per the BGLComp SDK for a single airport.
Much data and information for the airport is placed correctly above the airport header.
This is a capability we've never had before - and comes much closer to putting an airport correctly in the minimum number of files.
Yes, we could not do things that way in FS2004 - because the tool we used would scrub out all the parts of the airport, both above the header and under the header, which that tool did not understand.