"default" files are the basic setup presets, because need min 1 file configuration on each directory or the OS not work.

For the auto loading preset give a different name but I dont remember how must be written.
I try to search myself on the source code but I can not find. I don't have skill for writing CC+ code, I have to ask to my developer.
This is a 5 years old features and I relly don't remember how must working.
Right now my developer is to much busy for the Rack 2U VASIO firmware to debug, when have time will let me know what is the right name to save.

Just some there have a lot of time to test first the Audya OS4...